The animations are really nice. Does anyone have a guess what tool they're made with (based on font or other hints)?
Why we're blind to the color blue
31–40 of 218 posts
Re: Why we're blind to the color blue
#32I don't believe the blurred images at the end have anything to do with eye focus, as the author suggests. After all, chromatic aberration is blurring of only a very, very small amount. The demonstrated seemingly negligible perceptual effect of blurring blue to a huge degree in a multicolor image doesn't seem to have anything to do with that, but rather the fact that we perceive primary blue as a much darker color tha…
I mostly agree with you, but would add that blurring the blue is affecting the sharpness of the ocean, which has little detail in that image; blurring red or green affects details on the land, which are very noticeable. One might think the cloud-ocean edges would be blurred by the blurring of blue, but the clouds are so much brighter than the ocean (red & green channels), that you can barely notice any difference.
Re: Why we're blind to the color blue
#33I don't believe the blurred images at the end have anything to do with eye focus, as the author suggests. After all, chromatic aberration is blurring of only a very, very small amount. The demonstrated seemingly negligible perceptual effect of blurring blue to a huge degree in a multicolor image doesn't seem to have anything to do with that, but rather the fact that we perceive primary blue as a much darker color tha…
See the very low coefficients for the blue channel when converting (gamma-compressed) RGB to luma. E.g. the common Rec. 709 standard assigns only 0.0722 weight to blue.
Y' = 0.2126R' + 0.7152G' + 0.0722B'Re: Why we're blind to the color blue
#34I don't believe the blurred images at the end have anything to do with eye focus, as the author suggests. After all, chromatic aberration is blurring of only a very, very small amount. The demonstrated seemingly negligible perceptual effect of blurring blue to a huge degree in a multicolor image doesn't seem to have anything to do with that, but rather the fact that we perceive primary blue as a much darker color tha…
I'm not sure you're right. At night both I and my wife have reported difficulty reading glowing blue signs compared to glowing red/green signs at the same font size, brightness, and distance. I'm also not sure that the author is correct; the wrong-focal-distance explanation seems rather weak simply because our focal length is adjustable.
You have astigmatism. I have a similar issue with blue when not wearing my glasses. I have 20/20 vision, but my astigmatism makes it difficult to focus on certain things. A computer being a big one. Blue light blockers help, but with proper astigmatism correction I don’t need them.
Re: Why we're blind to the color blue
#35This would seem to explain why when you go to the optician, he's got a lot of red/green tests but never blue one as far as I can tell. The critical graph is the one with the blue peak to the left and the red and green near each other on the right. Also it seems to hint that there's a fourth receptor that humans don't have in the gap region. Tetra-chromatic creatures do exist IIRC.
Even tetra-chromatic humans exist, although it's pretty rare. The fourth cone tends to peak between green and red though.
Re: Why we're blind to the color blue
#36There's an optometry place in my neighborhood with a back-lit sign with big, blue block letters. And every time I walk by at night I note how fuzzy it looks.
I'm convinced this is an intentional troll. This optometrist knowingly picked a sign to make people momentarily question their vision.
Re: Why we're blind to the color blue
#37Blue is my favorite color. Has my whole life been a lie?
Blue is my favorite color and it seems like whenever I call something blue somebody tells me it’s green. I don’t like green.
I have no idea what to make of that.
Re: Why we're blind to the color blue
#38This is amazing to see. We should use this for image optimization. When we compress channels, we should compress the blue channel to like 30% while keeping others at fairly large 80% and it might appear better than a 60% compressed image.
We already do and have done historically. The most obvious example I know of is that 8bit color uses 3 bits for green and red and 2 for blue.
For some time many graphics cards had a 16 bit "hi-color" mode with 5:6:5 bits for RGB (SVGA, etc.). Most graphics card modes that used only 8 bits per pixel used that value as an index into an 256x(8x3) bit color palette (MCGA, VGA, etc.).
Re: Why we're blind to the color blue
#39I would guess the deeper reason is that the sky is blue. That makes it more useful to have good vision in red and green. If we needed good resolution everywhere, we might have had eyes optimizing for different colors, four eyes, etc. Also, it isn’t as simple as this article describes. The human eye can vary its focal distance ( https://en.wikipedia.org/wiki/Accommodation_(eye) ) over a larger range than the effect of…
What's funny is that most mammals can't distinguish between red & green.
For example: the reason why tigers have red camouflage is that their prey cannot distinguish them from the background green of the forest, combined with the fact that mammals cannot create green pigment for their fur (yet).
Re: Why we're blind to the color blue
#40I don't believe the blurred images at the end have anything to do with eye focus, as the author suggests. After all, chromatic aberration is blurring of only a very, very small amount. The demonstrated seemingly negligible perceptual effect of blurring blue to a huge degree in a multicolor image doesn't seem to have anything to do with that, but rather the fact that we perceive primary blue as a much darker color tha…
Chromatic aberration may be a contributing factor, but I am surprised the author didn’t mention that S cones (which we use to perceive blue) are only 2% of the cones in the retina [1]. Additionally S cones are distributed randomly when compared the regular lattice of M and L cones. The distribution of the different cone types alone may be sufficient to explain why our acuity for blues is impoverished relative to reds and greens.