What color is this? You’re probably thinking, “it’s red!” which, well, it is. And what about this? Why, it’s green, of course! And what video on color would be complete
without an appearance by our old friend blue? We’ve been using these three colors to fool
our eyes and brains into thinking that we’re looking at a full-color image for over a century. We can do this because of how our eyes and
brains perceive color. It’s all about ratios, and though it often
seems a little freaky, we can mimic the effect of any real color using just these three in
controlled amounts. But now that we have the luxury of bringing
the primary colors of light into the real world with bright, monochromatic LEDs, we
can get a glimpse into just how wonderfully strange our sense of color perception actually
is. In this video, we’re going to look at a
series of demonstrations where objects in the real world are lit using light from the
digital world. What we’ll find is that things can behave
a little… unexpectedly when we play around with light. None of the footage in this video has been
altered. I promise no matter how weird some of this
looks, I’m seeing the same things in person. Let’s start with a brief overview of what
it is we’re doing here. I’m using these RGB studio lights to provide
illumination. I can control the ratio of red, green, and
blue light they produce by adjusting their hue and saturation parameters. For the most part, we’ll be staying with
a saturation of 100%, and this means we’ll be cycling through the 3 primary colors, red,
green, and blue, as well as various shades of the three secondary colors that lie between
them, yellow, cyan, and magenta. When I need to, I can switch to standard
phosphor-coated white LEDs which provide a reasonable approximation of true, full-spectrum lighting. Yes, these lights really are G Bee’s knees. In RGB mode, the light they produce is trichromatic,
just like our vision, but each individual color is monochromatic, meaning it’s comprised
of a single wavelength. And this is where the breakdown between the
real and digital world can occur. I’ll explain this in a little more detail
shortly, but first let’s move on to a demonstration. We’ll be spending much of this video, in
the dark. Here we have a kind of disappearing, color-changing
ink. This whiteboard, when lit with apparently
yellow light, appears to have some red writing on it. Well, watch this. Now it’s gone. But it re-appears, now as a slightly more
orange color, with the presence of some blue light. Now watch as before your eyes the ink becomes
a jet black. It stays black even as the light grows brighter
and we approach cyan, before the black turns to red once more. And finally, it’s gone again. What’s happening here? Well, the ink on this whiteboard is in fact
red. Switching to normal white lighting reveals
that. The red ink absorbs nearly all of the light
coming from the green and blue LEDs, which is why the ink appears black when the scene
is anywhere between blue and green. It doesn’t reflect any of that light back
into the camera. But in addition to absorbing the green and
blue light, this red happens to be a near-perfect match to the red produced by the light’s
red LEDs. And that’s why it disappears under red light. The white of the whiteboard reflects pretty
much all of the red light back to the camera, as do most white objects, but so does the
red ink. And so, there’s very little contrast between
the ink and the board, and the ink effectively disappears. Let’s move on. What color is this can of spray paint? It’s pretty hard to tell, isn’t it? In fact, it’s impossible to tell. Right now, this can of spray paint is being
lit solely by the red LEDs, which means it’s lit by a monochromatic light source. Doing this fundamentally breaks our color
vision because we rely on the mixing of colors to determine what it is we’re seeing. Under the same red light, let’s look at
some construction paper. This packaging says there are 8 colors here. Well, what on Earth are they? As far as I can tell, these are red, a darker
red, a differently darker red, and uh, more red. I think there’s black, too, but I’m not
sure. With only one wavelength of light available
in this scenario, there’s just no way to know what it is you’re seeing. Notice how we cannot tell what the colors
are on these Rubik’s Cubes. We can see that each color reflects the light
back in different amounts, causing the stickers to appear in different brightness levels,
but they’re all just different shades of the same red. But, with this being a Rubik’s Cube, we
know the colors are white, yellow, orange, red, green, and blue. We can make some educated guesses into which
stickers are which colors. The brightest are probably red, yellow, orange,
and white, as these will reflect most or all of the red light back into the camera. The darkest are going to be blue and green. Now we can be reasonably sure the darkest
of them all is blue, as that’s farthest from red, and the next darkest is green. But as far as the bright colors? That’s really anybody’s guess. The brightest is probably white, but then
again there look to be too many that we might call white. So white and at least one other color look
kinda the same. But which colors are they? Well, let’s switch the light over to white
and find out. Oh, sorry, this one is actually monochromatic
lemme, lemme get that out of here. So, we were right about green and blue, but
orange, white, and yellow all appear to be the same. Red was actually slightly darker, which you
might not have expected given that we were using red light. This tells us that the hue of this red is
actually not purely red, as it does absorb some of the red we were throwing at it. And if yellow and orange were reflecting the
same amount of red light back as white, well that again goes to show how strange our color
perception is, and why monochromatic light breaks it. So how do we see in color? Well, in our eyes, we don’t just have a
bunch of plain photoreceptors. We have some, known as rods, which just detect
brightness, but those of us with typical trichromatic vision also have three types of color-sensitive
cells, called cone cells. These are pigmented to filter the wavelengths
of light that hit them. Now, we often think of these cone cells as
being sensitive to red, green, and blue light. Which is broadly true, but their actual stimulation
curves look like this. Notice how the medium and long cones, which
correspond to green and red, kinda, overlap a lot, but the short cone is way over there. Well, where they are along the spectrum doesn’t
actually matter all that much. What matters is that they respond differently
to any given color. Say we have a yellow-green wavelength right
here. Well, for this one color, and this one color
only, the long and medium cones get equal stimulation, and the blue cones get negligible
stimulation. This unique ratio allows our brains to interpret
this color as yellow-green. As we move towards red and head into yellow,
now the medium cone gets progressively less stimulated, and the long cone gets more stimulation. So, our brains know this color is closer to
red than it is green. As we continue moving deeper into true red,
the stimulation from the long cone starts to taper off, but the medium cone is tapering
off faster. The important thing to remember is that any
color at all along the visible spectrum will cause a unique ratio of stimulation between
these three cells, and so our brains know what color that is. And so, we can easily fool our eyes and brains
into thinking we’re seeing any color at all by using just three primary colors. We need one of them to be way over here, so
that the long cone gets a fair bit of stimulation, but the medium cone doesn’t get all that
much. So we’ll use red. We also need one to the left of the long-medium
crossover, that way it stimulates the medium cone more intensely than the long. So we’ll use green. And of course, we also need one way over here
that stimulates the short cone a lot, but doesn’t really influence the other two. So we’ll use blue. Now, to make a color like yellow-orange, we
can simply mix red and green together, so that there’s a lot of red and a bit of green. This mixture causes the same stimulation that
an actual yellow-orange object would. Because there’s overlap between the three
cone cells, all real colors just cause a unique mix of stimulation between the three of them. That includes, by the way, white, which is
all three in close to equal amounts. So, if we use three pure colors that allow
us to selectively stimulate the three cells with any given ratio, we can artificially
reproduce all visible colors. Our eyes simply don’t have a way to know
they’re being fooled. But while we can make any color appear by
using just three colors in different ratios, that doesn’t mean that the world will look
right without the whole spectrum to paint the whole picture. And unless we have a way to make the cone
cells get stimulated in different ratios, we can’t see color at all. And with that in mind, let’s move onto some
more demonstrations. This scene contains many red objects. But, under monochromatic blue light, you’d
never know. Watch what happens, though, when I add just
the tiniest amount of red light. Suddenly, the red pops into existence. This is a pretty trippy effect in person,
because it’s as if someone’s messing with the RGB sliders of real life. Until we have red light available, red objects
appear, well, grey or black. Even with green light, the same thing occurs. Notice how with green and blue light together,
we can start to see the yellow and oranges of the Rubik’s Cube become distinct from
the blue and green. Still, though, the red objects remain completely
dull. Pure green light keeps them in the dark, just
like blue. Keep in mind that the green light is still
stimulating the long cones a fair bit, but without a third, longer wavelength to allow
for comparison between the long and medium cones, our brains cannot see red. Plus, since the red objects in the scene aren’t
reflecting any of that green light, they stay dull. Add just a hint of red, though, and suddenly
the scene explode into color. Now, there is red light to be reflected, and
more importantly for our eyes, there is red light to be detected and compared with green
and blue. Here’s a different kind of color. A game boy color. Under blue light, this thing looks weird to
say the least. Now I’ll add a bit of red and green, alternately. Compare the light on my hand to the light
on the game boy, and you’ll see that overall, I’m not changing the color in the scene
much at all. But the game boy drastically changes. This game boy’s color, by the way, is dandelion. Which is of course, to our eyes, a mixture
of red and green. An important thing to note is that, just like
our eyes, the camera’s Bayer filter (which actually separates subpixels into red, green,
and blue elements) doesn’t filter red, green, and blue perfectly. There’s a lot of overlap. And I can show it to you, even with only one
wavelength to see. You might assume that if light is a monochromatic
green, then the camera’s blue and red subpixels will never become active. But this isn’t true. If I overexpose the image, you’ll see that
it starts turning white. That happens because even though the light
source is monochromatic, the red and blue filters will still let some through, so the image
starts to turn white with enough exposure. The same thing happens with blue and red. However, this doesn’t mean we can start
to tell colors apart. We still only have one wavelength illuminating
the scene, which means the ratio of stimulation in the camera’s subpixels stays the same. The camera’s method of vision is surprisingly
similar to our eye’s. Well, as a matter of fact it’s built for
our eyes. And even under normal exposure levels, there
is some green slipping in. You might expect the image to turn black if
I remove all of the red channel, but in fact there’s a faint green image hiding underneath. That green is actually helping to define the
ultimate hue of the red we’re seeing on-screen. Which brings me to my next demonstration. We can have a monochromatic light source of
any color, not just red, green, and blue. With RGB lights, I can only produce yellow
light by mixing red and green. This then becomes a dichromatic color, and
if I illuminate this scene with it, we can actually tell some of the colors apart. We can even kinda tell blue from green. But, if I break out my yellow traffic light
module (or amber, whatever), this is in fact a monochromatic yellow. This color looks quite similar to the yellow
I’ve been making by mixing red and green, but it’s actually very different. So now, even though the green and red subpixels
are both getting stimulation from the yellow light, because it’s actually just yellow
they always receive the same relative stimulation no matter what’s in the scene. Our eyes, and the camera, both see these two
sources of light as essentially the same color, but if we use them to illuminate the real
world, and take a look at how they get reflected back, we discover they’re actually very
different. And that brings us to what makes this whole
ordeal so messy. You may have heard of a term called the color
rendering index, or CRI. This describes how well an artificial light
source reproduces the color of the objects around us. Incandescent lights, being a blackbody radiator,
had a perfect CRI, just like the sun, but more efficient LED and fluorescent light sources,
indeed practically all light sources that aren’t incandescent, don’t emit light
as a perfectly uniform spectrum. Now, as we know, one of the most common ways
to mimic white light is to produce red, green, and blue light, because, well, if you haven’t
figured that out by now you’ve not been paying much attention. This works absolutely fantastically for creating
a display device like the one you’re staring at now. Because it’s providing its own illumination,
it doesn’t need to worry about how the red, green, and blue channels interact with the
objects around you. It just needs to fool your eyes into thinking
they’re looking at a full-color image. And, well, displays are getting better and
better, with incredibly lifelike colors, all from just three colors of light. Except for that one time Sharp got all weird
with the yellow subpixel which was absolutely unnecessary especially since nobody’s encoding
color in an RGB-Y space, but I digress. But the problem with using just three colors
of light to illuminate the real world is that this rarely looks right. Think about that whiteboard earlier. The red ink was invisible under red light. This meant that it reflected practically all
of the red light back. Now, imagine I’m using these lights with
red, green, and blue all working together. This looks white to my eyes, but when it gets
reflected off of the objects around me, the ratio of colors coming back can be way off. In the case of the whiteboard, the red looks
way too intense and bright. Which makes sense. If one third of the light from these lights
is red, and the red ink reflects all of it, it’s suddenly freakishly bright because,
well, red is not one third of the color spectrum. Under true white light, a much greater percentage
of light gets absorbed, and the red appears more dull, like it should. As a quick note, this is the one demonstration
where the camera couldn’t quite capture what my eyes were seeing. The difference in person is much more dramatic. The problem here is that the ability to reduce
the real world into three wavelengths of light is not reversible. If we have a truly white light source, then
all the in-between colors get reflected as they truly are. Our eyes can see any wavelength of light because
of all that overlap between the cone cells. And indeed, cameras can see any wavelength
of light, because their RGB bayer filters also have overlap between them. And so we can reproduce the stimulation real
objects cause in our eyes with just three wavelengths of light, but we cannot expect
those three wavelengths to produce the same stimulation ratios that they should when they
hit and get reflected off of real objects in the real world. This can perhaps best be demonstrated by the
color purple. Purple is a rather strange color in general. It, along with magenta, are what are called
non-spectral colors. If you look on the color spectrum, you’ll
find violet just on the other side of blue, but true violet is rather dull, and in fact
we have a hard time seeing it. Which is no surprise since it barely registers
with any of our cone cells. Purple and magenta are kinda similar to real
violet, but in a sense, these colors exist only in our minds. That’s pretty wild, when you think about
it. Now obviously purple things exist in nature
and we can see them with our eyes, so it’s not like the color is imaginary. But, it cannot be reproduced with a single
wavelength of light. We only see purple and magenta when our eyes
receive blue and red stimulation, but little green. Therefore, purple and magenta objects absorb
a fair bit of green light, but reflect both red and blue. And luckily, our brains have synthesized this
combination of stimulation into magenta, and not the average wavelength between them, as
we do with yellow and cyan. Otherwise, it would be another green. Anyway, let’s take a look at our old friend
Putt-Putt. This particular anthropomorphic automobile
is a rather vibrant shade of purple. Now, using the phosphor-coated white LEDs,
he looks pretty normal. But when I switch to the RGB LEDs, well not so much. Under green light, he looks pretty dull. Which we might expect, given that we can of
course make purple by mixing red and blue pigments, which will together absorb mostly
green wavelengths. When we add blue light, well now he just looks
blue. All into the cyan range, Putt-Putt looks just
like a blue, and once we hit blue, well now he looks kinda like a grey, as his white features
become blue, and his body becomes a slightly darker blue. But here’s the weirder thing. Add red, and now he really looks grey. If I change the angle so you can see his tongue,
yes cars have tongues, duh, his tongue is bright red, but his body still looks grey. And perhaps stranger still, replace the blue
with some green and move into yellow territory and he looks… burgundy? A burnt red? I don’t know exactly what this color is,
but it is not purple. Now, some of this is down to how our brains’
white balance works, as we are comparing his white eyes to his body color, and in fact
if we look in Photoshop we’ll see that what looked grey to us is actually fairly purple. It’s not the right purple, but it is purple. And when you think about it, that makes perfect
sense. Assuming this shade of purple is just a darker
magenta, then if lit with magenta light, his body would appear to be the same hue as his
white features, but at a reduced intensity. Without any sort of color contrast, that reduction
in intensity just looks … grey. Grey is simply a darker version of white,
and what is white in this scene, is actually magenta. This also explains why his tongue looks so
vibrant. His tongue is now the only thing actually
changing the relative amounts of color being reflected back. Since it absorbs blue like a good red should,
it’s now able to set itself apart from the magenta mess that is everything else. And of course, we can also explain why he
looks red under yellow light. His body will be absorbing most of the green
coming from the lights, so the only thing it reflects back is red. It looks a little weird because of the fact
that it does absorb some of the red just as it absorbs some blue, so it looks darker than
his tongue. And our brains’ vain attempt to compensate
for the yellow light and assume that’s real white makes it look stranger, still. Now we’re not quite yet done with Putt-Putt. So far, I’ve been showing you how he looks
under various colors of light. But even under apparently white light, comprised
of red, green, and blue, this purple color simply does not get rendered correctly at
all. Notice how differently he looks under normal
white light using the phosphor-coated LEDs, compared to the false white made by the RGB
LEDs working together. Something about the way this purple absorbs
wavelengths in the visible color spectrum simply cannot be reproduced using a trichromatic
RGB light source. At least, not these lights. So keep in mind that even though I can show
you this royal purple on a screen using only some red, some green, and some blue, I can’t
just use those three colors in the real world and expect to achieve the same result. Now, before I leave you, well first of all
that can of paint was yellow, sorry I forgot to answer that earlier, but more importantly
while setting these demos up I think I may have accidentally discovered one of the most
effective ways to understand color blindness. Now, I’ve seen lots of simulated images
online, but they’ve never really clicked with me like this did. The most common type of color blindness is
red-green colorblindness. There are varying degrees of this deficiency
but in general it means that the green / medium cones are either malfunctioning or not present. Now, I have no way to turn down or otherwise
stop the green cones in my eyes from working. But, if I light the room I’m in with dichromatic
magenta light, the effect is somewhat similar. Now, it’s not like this is what a color-blind
person sees. Especially because the entire scene is intensely
colored, and green objects, like this marker, appear very dark, not simply similar to red. But, for the first time, I truly felt like
I could not distinguish red and green all that well. The snake figure, here, suddenly had its red
and lime green become awfully similar. Again, this is by no means accurate, look
at how the green stickers on the Rubik’s Cube look black, but it is certainly interesting
to have the color information of the real world become limited in ways I’ve never
experienced. Anyway, that’s it for now, I think. I didn’t buy these lights assuming I was
going to make a video about how strange RGB lighting is, but playing around with them
led to some interesting places. And honestly, it’s helped me understand
color vision even better than I did before. Thanks for watching, and as always a huge
thank you goes out to the people supporting this channel on Patreon. Thanks to the support of people like you,
I can make bizarre little detours like these, and I really enjoy it. I hope you do, too. If you’d like to join these people in supporting
my work, you can check out the link in the description. Thanks for your consideration, and I’ll see you next time! ♫ trichromatically smooth jazz ♫ Hey! It’s me! But from the future! Woah. So many of you probably know this but if you
didn’t, I have a second channel where I sometimes upload rather random things, they
tend to be kind of rambly, and I wanted to let you know that following this video I want
to have a more relaxed discussion about some of the subtle differences between using true
white lighting and RGB white lighting. So if you want to check that out, there’s
gonna be a link in the description as well as a card on the end screen. For now, I hope you’re enjoying this rather
groovy looking Rubik’s Cube. It’s pretty groovy looking. Groovy.

The Weird World in RGB
Tagged on:                                                     

100 thoughts on “The Weird World in RGB

  • September 1, 2019 at 7:03 pm
    Permalink

    This was a fantastic video, and now I want to play with colored lighting on camera, too.

    I've always enjoyed the effect you get from aiming two color lights at an object from different angles to get a relatively normal looking object but with colored shadows.

    Reply
  • September 1, 2019 at 7:04 pm
    Permalink

    In this video i learned about biology, cameras and displays, just… Wow

    Reply
  • September 1, 2019 at 7:15 pm
    Permalink

    There a no digital images of violet. And I think most forms of printing also don't create mixes of inks that reflect violet light.
    Which I think is why most people don't really know what violet looks like.

    Reply
  • September 1, 2019 at 7:58 pm
    Permalink

    So, is putt-putt blue or gold?

    Reply
  • September 1, 2019 at 8:00 pm
    Permalink

    Samsung's QLED TVs are probably the closest I've ever seen in RGB that comes close to achieving near perfect white. That's why colors look so lifelike on a QLED TV.

    Reply
  • September 1, 2019 at 8:37 pm
    Permalink

    I did a lot of this the day I got an RGB lightbulb for my room

    Reply
  • September 1, 2019 at 8:51 pm
    Permalink

    I wish I could see these colours correctly

    Reply
  • September 1, 2019 at 9:19 pm
    Permalink

    Yo are you fix it Felix

    Reply
  • September 1, 2019 at 9:49 pm
    Permalink

    Yellow, cyan and magenta are the primary colours you nincompoop

    Reply
  • September 1, 2019 at 10:32 pm
    Permalink

    Could be interesting to print some of those "colour blindness" check images and expose or fade into missing light parts. This could visually convert them to the image you may or may not see with the matching defect?

    Reply
  • September 1, 2019 at 10:48 pm
    Permalink

    Difficult stuff

    Reply
  • September 1, 2019 at 11:33 pm
    Permalink

    I have experimented this with a remote controlled color changing LED light.

    Reply
  • September 1, 2019 at 11:56 pm
    Permalink

    The Red Menace!

    Reply
  • September 2, 2019 at 12:17 am
    Permalink

    Very interesting. Playing around with a low pressure sodium street lamp gives kind of the same weird effects as pure red, but since it is a nearly pure 589nm emission spectrum rather than an assembly of RGB, it still makes everything look monochromatic deep amber without being red, blue, or green.

    Reply
  • September 2, 2019 at 12:22 am
    Permalink

    I might be colorblind

    Reply
  • September 2, 2019 at 12:25 am
    Permalink

    This must have been super trippy to do in person!

    Reply
  • September 2, 2019 at 12:33 am
    Permalink

    when my man said the ssecondary colors were yellow cyan and magenta I cried inside….

    Reply
  • September 2, 2019 at 1:29 am
    Permalink

    The color changes can even be used for magic! Saw this on Penn&Teller Fool Us and immediately thought of Technology Connections! https://youtu.be/MCRW4FMQ0cc

    Reply
  • September 2, 2019 at 1:33 am
    Permalink

    8:50 "notice how with green and blue light together, we can start to see the yellow and oranges of the Rubik's Cube become distinct from the blue and green, still though, the red objects remain completely dull"
    Erm, the clearly red Etch-a-Sketch disagrees!

    Reply
  • September 2, 2019 at 2:17 am
    Permalink

    This video was simply brilliant.

    Reply
  • September 2, 2019 at 2:33 am
    Permalink

    19:25 Ube flavored Desk

    Reply
  • September 2, 2019 at 3:19 am
    Permalink

    This is the most interesting boring channel and I don't even know if I like it or not

    Reply
  • September 2, 2019 at 3:42 am
    Permalink

    16:07 "Anyway, let's take a look at our old friend Putt-Putt."

    PeanutButterGamer wants to
    Know your location

    Reply
  • September 2, 2019 at 3:54 am
    Permalink

    As someone which likes certain shades of purple, that's not grey at all. Maybe it looked grey in person with your eyes, but the camera says: purple.
    Edit: nvm, but this purple is kinda wierd and i like to have the RGB coding for it. Blue channel on cameras is abyssmal anyway.

    Reply
  • September 2, 2019 at 4:14 am
    Permalink

    Now all this video needs is some VSauce background music.

    Reply
  • September 2, 2019 at 4:20 am
    Permalink

    I totally called it that the can of paint was yellow at the beginning

    Reply
  • September 2, 2019 at 4:45 am
    Permalink

    I actually was thing that the gray was still purple

    Reply
  • September 2, 2019 at 5:27 am
    Permalink

    All these lights won’t make my future any brighter.

    Reply
  • September 2, 2019 at 5:29 am
    Permalink

    16:50 I don't see Grey at all.

    Reply
  • September 2, 2019 at 5:29 am
    Permalink

    Its interesting how the classical subtractive primaries (RYB) are actually wrong, and instead its closer to the standardized printing colors (CMY). Really messes up a lot of art stuff, like paint mixing (you can mix your own red and blue).

    Reply
  • September 2, 2019 at 5:38 am
    Permalink

    Oh wow!! I do this every day in my room!
    I have full range+UV led strips along the ceiling.
    As I change the colors, it changes how things look. Red plastic cups can look orange and yellow and purple, depending on the selection of the complex lights. It's super cool!!

    Reply
  • September 2, 2019 at 5:59 am
    Permalink

    What the ending music

    Reply
  • September 2, 2019 at 6:00 am
    Permalink

    My light is rgb so I can barley solve my Rubik’s cube most the time

    Reply
  • September 2, 2019 at 6:15 am
    Permalink

    Yo! That was dope.

    Reply
  • September 2, 2019 at 8:49 am
    Permalink

    You got me. I call the yield light amber.

    Reply
  • September 2, 2019 at 9:00 am
    Permalink

    I put a Red Green and Blue light bulb in the bathroom several years ago. Playing with shadows. Changing the position of the lights change the color of the shadows. It's very strange. Even though the room is white every shadow is a different color.

    Reply
  • September 2, 2019 at 9:06 am
    Permalink

    Colorblind Simulator: Real Life Edition

    Reply
  • September 2, 2019 at 9:27 am
    Permalink

    Can you delve into 3-d printer tech? Thanks.

    Reply
  • September 2, 2019 at 9:45 am
    Permalink

    My brain perceives color exactly as the Photoshop color picker shows. It was fun to experience the whole What color is the dress controversy as 95% of people can't see the complexities. It was like a bunch of neanderthals in a cave collectively deciding that this is the world and they get riled up when you mention to them that there's an outside. Precious!

    Reply
  • September 2, 2019 at 10:14 am
    Permalink

    It doesn’t look grey it’s purple. I learnt so much with this tho

    Reply
  • September 2, 2019 at 11:31 am
    Permalink

    This video answered a lot of my questions about how the eye mixes colours and why CRI is important

    Reply
  • September 2, 2019 at 1:15 pm
    Permalink

    No that even stupid
    But I'm pretty sure RGB are secondary colours and yellow, cyan and magenta are primary colours.

    Reply
  • September 2, 2019 at 2:45 pm
    Permalink

    Have any other cubers clicked on this because of the thumbnail?

    Reply
  • September 2, 2019 at 3:04 pm
    Permalink

    I thought this is going to be a rubiks cube video

    Reply
  • September 2, 2019 at 3:45 pm
    Permalink

    I want to finish t his video but for some reason all the color changes is causing weird pains in my eyes, I've never experienced this before is this happening to anyone else?

    Reply
  • September 2, 2019 at 3:50 pm
    Permalink

    Almost a week later and I can’t stop thinking about this video. The biggest question I want answered: could you move the individual light components around the spectrum and still accurately simulate various colors? Presumably, moving red and blue towards the center would limit you’re ability to display those colors, but if you moved the center/green component around, could you adjust in software and still reproduce most colors?

    Reply
  • September 2, 2019 at 3:59 pm
    Permalink

    well if you havnt figured that out yet then you haven't been paying attention.
    quote of the year

    Reply
  • September 2, 2019 at 4:09 pm
    Permalink

    4:53 greatest plot twist of all fucking time, didnt see that coming!!

    Reply
  • September 2, 2019 at 4:26 pm
    Permalink

    isnt yellow a primary and green a secondary

    Reply
  • September 2, 2019 at 4:43 pm
    Permalink

    My Life, argueing with a shitty screen simply because I'm sick and have nothing better to do:

    "What color is this?"
    Orange!"
    Why red of course"

    "What color is this can of spray paint?"
    White, maybe yellow
    "It's pretty hard to tell, isn't it. In fact, it's impossible to tell"
    That-that's clearly white or a very light grey, or damn yellow

    "Notice how we can't tell what color each of these rubiks cubs is…"
    The first one is probably a joke, since it's got a red-orange color, a yellow, and two shades of brown and a black along with a dark red, which, rubiks cubs don't have 3 dark colors
    On the other one, I see black and brown, yellow, orange and a slightly off orange, and red… so probably blue and green, white, orange, and red the slightly off orange is yellow
    "But they're all just different shades of the same red… but as far as the bright colors go we don't know"
    … Uh…

    "This scene contains many red objects, but under monochromatic blue light you'd never know"
    But I see faint red in every object that appears purple… which is all the red objects!
    Also under green light the red still shows damn red!

    "Here's a different kind of color, a gameboy color. Under blue light this things looks weird to say the least"
    It looks yellow-orange… not that weird
    "Now I'll add a bit of red and green alternately"
    Now it's red-orange… and now it's yellow
    "It's actually dandelion yellow"
    No shit

    "We can kinda tell blue and green apart"
    They always looked like blue and green though
    "But if we use them to illuminate the real world it's very different"
    This is the first time I'm gonna say, both sets look the exact damn same

    "Under green light he looks pretty dull"
    He looks brown-purple and sick as fuck
    "Add red and he looks really grey"
    It looks like a pale blue-purple
    "Under magenta light his body would appear to be the same hues as his white features but at a reduced intensity"
    His eyes are a very light, near white, purple while his body is magenta, he still looks sick as fuck, what did you damn feed him?
    "Now we're not quite done with put-put"
    DON'T MAKE HIM SICKER

    Reply
  • September 2, 2019 at 5:01 pm
    Permalink

    about 5 mins in, i had to look outside the window to realize, that im still seeing different coloured things xD it's very confusing! thanks for that experiment!

    Reply
  • September 2, 2019 at 6:32 pm
    Permalink

    Oh so this is what color blindness is like

    Reply
  • September 2, 2019 at 6:42 pm
    Permalink

    it is mind teaser

    Reply
  • September 2, 2019 at 6:43 pm
    Permalink

    i did some experimenting with colour filtering after watching this video and tried to create images that look sort of like what a colour blind person might see changing the red channel to green or the green channel to red

    Reply
  • September 2, 2019 at 7:49 pm
    Permalink

    Lol wasn't Yellow the third primary color why is green a thing

    Reply
  • September 2, 2019 at 8:45 pm
    Permalink

    I'm seeing conflicting theories on why you said PuttPutt was gray. Would you please address this? At no point did PuttPutt look gray to me, so I was and still am curious.

    Reply
  • September 2, 2019 at 9:03 pm
    Permalink

    I'm a bit confused by the bit at 19:02 as far as I can tell the color of the body of the car looks the same in both lights just everything around looks a bit different and the white looks a bit more blue. The body color though looks almost the exact same? Am I going crazy?

    Reply
  • September 2, 2019 at 9:36 pm
    Permalink

    Oh oh! Can we try cheese squigglies next?

    Reply
  • September 2, 2019 at 9:47 pm
    Permalink

    https://youtu.be/fcZlmdUo-jQ?t=27 🙂 And you need no fancy RGB LEDs for this 🙂

    Reply
  • September 2, 2019 at 10:30 pm
    Permalink

    Brilliant video. More like this please!

    Reply
  • September 2, 2019 at 11:06 pm
    Permalink

    Didnt even notice i watched this through a blugh light filter

    Reply
  • September 3, 2019 at 12:17 am
    Permalink

    I KNEW IT, GREY IS DARK WHITE

    Reply
  • September 3, 2019 at 1:47 am
    Permalink

    I loved this one! So much good info in this channel!

    Reply
  • September 3, 2019 at 1:57 am
    Permalink

    Never seen a video of yours before, got in my recommendations and watched the whole thing at 4 am. Maybe I should sleep.

    Reply
  • September 3, 2019 at 2:21 am
    Permalink

    Another superb video! First half, very trippy, too.

    Reply
  • September 3, 2019 at 2:24 am
    Permalink

    14:14 "Adding more red objects makes it easter…"

    Reply
  • September 3, 2019 at 2:40 am
    Permalink

    Not sure if you have ever touched on printers, and why they use cyan magenta yellow and black in most printers. The reason is additive vs subtractiive black. When projecting an image on a dark background, you can subtract light to get black, however on a white background you need additive colors. When you combine those colors CMY you get a composite black (okay so more like a composite poop color), and when you add an actual black, you can increase the contrast of that image as well as produce a true black. Coincidentally this is why when you try to print white on a colored piece of paper, you get…. Whatever color the paper is. Because the printer interprets white as the absence of color. Some light reading…. see what I did there https://www.xrite.com/blog/additive-subtractive-color-models

    Reply
  • September 3, 2019 at 3:11 am
    Permalink

    I think my brain's whitebalancing is messed up because I could see the purple just fine.

    Reply
  • September 3, 2019 at 4:23 am
    Permalink

    😱😱😱😱😱😱😱😱😱😱 This is so interesting 😁

    Reply
  • September 3, 2019 at 5:01 am
    Permalink

    17:01 Is it just me or does his body not look gray. It looks like a shade of purple to me…

    Is this due to my eyes being more stimulated by this particular purple than yours, or could it be the monitor? Probably hard to say for sure.

    Reply
  • September 3, 2019 at 6:19 am
    Permalink

    My PC cabinet has blue LED lights around the fans … So I tried to make a wallpaper which matches that color … But no matter what I could not make the screen emit the exact same color as those fan LEDs emit … That day I realized what this video explains in detail

    Reply
  • September 3, 2019 at 6:50 am
    Permalink

    This was the most difficult area in the witness tbh

    Reply
  • September 3, 2019 at 8:33 am
    Permalink

    This made me think of Edith Head, a Hollywood costume designer who would apparently wear blue-tinted glasses to approximate how things would look in a black & white movie. I don't fully know if this is true or an urban legend (a quick fact check gave me her IMDb trivia page and an article from THR, neither of which cited a source for it), but it's an interesting idea nonetheless! 😎

    Reply
  • September 3, 2019 at 9:33 am
    Permalink

    I thought it was red blue and yellow

    Reply
  • September 3, 2019 at 9:40 am
    Permalink

    this hurts

    Reply
  • September 3, 2019 at 11:26 am
    Permalink

    I’ve never understood what “nonspectral color” meant until now. This is freaking fascinatingg

    Reply
  • September 3, 2019 at 1:01 pm
    Permalink

    I remember, back when I bothered with P&P RPGs I had this red pen I used to highlight stuff on my notes and sheets. And the guy hosting the games had RGB mood lighting. When he switched it to red, I could no longer read my stuff.

    Reply
  • September 3, 2019 at 2:02 pm
    Permalink

    Any chance you could link the lights you used?

    Reply
  • September 3, 2019 at 2:34 pm
    Permalink

    Illusion 100

    Reply
  • September 3, 2019 at 2:43 pm
    Permalink

    Orange light-blue blue

    Reply
  • September 3, 2019 at 4:51 pm
    Permalink

    so is this graph at 6:56 the reason why yellow and cyan appear so much brighter than all the other colours?

    Reply
  • September 3, 2019 at 6:27 pm
    Permalink

    2:33 Yes but actually the complete opposite

    Reply
  • September 3, 2019 at 10:11 pm
    Permalink

    Can you link me to where i can buy that light

    Reply
  • September 3, 2019 at 10:45 pm
    Permalink

    I feel like youtube is watching me. Just today I was at the theater where they used bright yellow light and under it everything was yellow and everything that was farther away from the yellow light was (like explained in the video) was a darker yellow color. I couldn't tell the color of my pants anymore even tho I knew they were blue. It really fascinated me and I showed my friend but she didn't care lmao

    Reply
  • September 3, 2019 at 11:50 pm
    Permalink

    This kinda gave me a headache lol

    Reply
  • September 4, 2019 at 2:42 am
    Permalink

    So, you are gonna tell us where to get those lights, right?

    Reply
  • September 4, 2019 at 2:46 am
    Permalink

    Hey grandpa, we say trippy nowadays. haha I LOVE your videos man!

    Reply
  • September 4, 2019 at 3:42 am
    Permalink

    I've had this issue when solving Rubix cubes in bed with my yellowish desklamp

    Reply
  • September 4, 2019 at 4:35 am
    Permalink

    3:54 wait does every one see 3 blue pieces of paper or am I color blind

    Reply
  • September 4, 2019 at 5:08 am
    Permalink

    1:24 he said “the three primary colors red, green, blue,” it’s red yellow and blue lol

    Reply
  • September 4, 2019 at 5:43 am
    Permalink

    IT'S NOT GREY!

    Reply
  • September 4, 2019 at 5:47 am
    Permalink

    More of this, please. Lots more.

    Reply
  • September 4, 2019 at 10:01 am
    Permalink

    I have protanopia. I envy you all. Everything must look so much nicer with more saturation.

    Reply
  • September 4, 2019 at 10:58 am
    Permalink

    I hate this video
    Im colorblind

    Reply
  • September 4, 2019 at 11:53 am
    Permalink

    You've only lightly touched on the spatial component of colour vision… There are even more weird things that you can do with RGB lighting. Take a look here: http://www.vislab.ucl.ac.uk/land_mondrian_experiment.php
    The whole field of human colour vision has seen debate and contention across the years, so if you want to understand it a bit more, look up Thomas Young, Ewald Hering, Hermann von Helmholtz, David Hubel and Torsten Wiesel, Semir Zeki and Edwin Land (and his Retinex theory).

    Reply
  • September 4, 2019 at 3:19 pm
    Permalink

    This is the best version of this subject I've seen. It is really rare to watch a video on vision that doesn't contribute to a few misconceptions.

    Reply
  • September 4, 2019 at 5:26 pm
    Permalink

    Please do more colourblind approximations. My boyfriend is colourblind, but not red-green and although I have seen pictures, I still don't understand what he might not see.

    Reply
  • September 4, 2019 at 6:07 pm
    Permalink

    no it's orange

    Reply
  • September 4, 2019 at 6:57 pm
    Permalink

    This is the strangest episode of Digimon I've ever seen…

    Reply
  • September 5, 2019 at 3:10 am
    Permalink

    The Witness flashbacks

    Reply

Leave a Reply

Your email address will not be published. Required fields are marked *