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Impossible color

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Re: Impossible color

#11

Post by skrebbel »

deckar01 wrote: post #5

I’m surprised the section towards them end about alternating high contrast colors producing impossible colors doesn’t link to “fechner colors” [0]. I am red-green colorblind, but when I was young I would stare at my dark ceiling fan spinning over the white ceiling and see very vivid greens and purples swimming across the blades. [0]: https://en.m.wikipedia.org/wiki/Fechner_color

Seems like you're well positioned to add that to the article‽

Re: Impossible color

#12

Post by camillomiller »

skrebbel wrote: post #11
deckar01 wrote: post #5

I’m surprised the section towards them end about alternating high contrast colors producing impossible colors doesn’t link to “fechner colors” [0]. I am red-green colorblind, but when I was young I would stare at my dark ceiling fan spinning over the white ceiling and see very vivid greens and purples swimming across the blades. [0]: https://en.m.wikipedia.org/wiki/Fechner_color

Seems like you're well positioned to add that to the article‽

The interrobang is spreading all over hackernews!

Re: Impossible color

#13

Post by AstralStorm »

zokier wrote: post #10
matte_black wrote: post #6

Isn’t it trivial to show impossible colors in VR by texturing an object in different colors like blue and yellow for each eye’s perspective?

Traditional displays (such as what would be used in vr goggles) do not produce yellow light. You only get reddish-green with rgb colors

Technically you could make such an extended gamut OLED screen, 4-stimulus. Probably RBGY variant. Some such screens are on the market already but they do not really produce superior results. Some phone screens use RBGW pattern too.

Re: Impossible color

#15

Post by speps »

matte_black wrote: post #6

Isn’t it trivial to show impossible colors in VR by texturing an object in different colors like blue and yellow for each eye’s perspective?

Some interesting work around this research paper:

Zhang, Haimo, Xiang Cao, and Shengdong Zhao. "Beyond stereo: an exploration of unconventional binocular presentation for novel visual experience." Proceedings of the SIGCHI Conference on Human Factors in Computing Systems. ACM, 2012.

http://www.shengdongzhao.com/wp-content/uploads/2012/06/chi2...

Re: Impossible color

#18

Post by azernik »

Playing off the "chimerical color" examples - it's possible to approximate the effect of "imaginary colors" (activation of only one cone cell type) by fatiguing the other two and then looking at the target color. e.g. staring for a while at #FF00FF and then switching immediately to a #00FF00 makes the green "pop" in a strange way.

Re: Impossible color

#20

Post by BenFrantzDale »

empath75 wrote: post #3
ohiovr wrote: post #2

When adjusting paint colors if what you have is too red “or on the red side” you can correct it by adding green. If what you have is on the blue side add yellow then kind of straighten out the undesirable green by adding a smidge of red. This is the sort of thing a skilled shader technician would do to match automotive or sign paint. I did this for a while for PPG You might find playing with the LAB color scale in ph…

Isn’t brown just a reddish green. Or a greenish red.

Yes and no. Brown is just dark orange, which you can sort of get by mixing red and green paints. Paint mixing is weird, though. (I’ve written paint-matching software professionally.)
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