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22nd November 2018, 12:54 | #1 | Link |
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How many colors do we need to completely cover human vision?
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I'm curious about this. The familiar CIE "horseshoe" diagram implies to me that it can be done. Though I have no idea what the x/y axis represent I assume they can't go to negative, or zero. Color systems clearly can go past the the edge of the "horseshoe" curve. As shown on the image for ProPhoto RGB. By the looks of it the curve could be contained with a 4-5 corner (color) polygon. |
22nd November 2018, 13:55 | #2 | Link |
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Most humans can discern about 10 millions colors, although there are supposed to be a few that can see in the region of 100 million.
Color vision table, The table about 2/3 the way down the page. https://en.wikipedia.org/wiki/Color_vision Insects eg some bees and birds, eg humming birds can see in the region of 10 billion colors (some humming birds and bees can see in the Ultra Violet, and eg Rattle Snakes can see in the Infra Red [although not with their eyes, special pits approx where nostrils would be]).
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I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ??? Last edited by StainlessS; 22nd November 2018 at 15:36. |
22nd November 2018, 19:13 | #3 | Link | |
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22nd November 2018, 23:50 | #6 | Link | |
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But yes , it can be completely covered and exceeded, by ACES for example . It has been used in actual production workflows for a few years now . https://commons.wikimedia.org/wiki/F...olorspaces.svg Open Source tools like Natron can handle ACES with opencolorIO, and blender has limited support too |
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23rd November 2018, 01:38 | #7 | Link | |
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Anyway. What I meant was how many wavelengths/frequencies of colors (instead of RGB) to be mixed. (in a pixel for example) |
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23rd November 2018, 01:40 | #8 | Link | ||
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What wavelength colors does it use? Is it still RGB? (And only more bits are required) (Hopefully someone will update the more used image file I got from wikipedia with this colorspace) Last edited by mzso; 23rd November 2018 at 01:51. |
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23rd November 2018, 02:34 | #9 | Link |
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there is again no answer to the bit deep question.
even 1 bit is enough if the resolution(of cause the get totally out of hands with 1 bit but not with 6 bit) is high enough and brightness has an effect on the needed bit deep too and here starts the next question what is the "maximum brightness". XYZ is not RGB based as far as i know; https://en.wikipedia.org/wiki/CIE_19...E1931_rgxy.png |
23rd November 2018, 03:10 | #10 | Link | |
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Typically 16bit half float , or 32bit full float are used . I don't know if there is a "minimum" value, but I've never seen anything ACES related below 16bit half float. Even though the values are represented by ACES , no current display will show all of them (ie. no current display has full ACES coverage) . So right now it's just used in acquisition and post production workflows, not for end delivery https://en.wikipedia.org/wiki/Academ...ncoding_System |
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23rd November 2018, 13:16 | #11 | Link | |
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25th November 2018, 04:12 | #14 | Link |
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The deeper you try to understand how human vision works, especially color vision, the more "it depends" comes up. :/
The Royal Institution, The Physics and Psychology of Colour - with Andrew Hanson https://www.youtube.com/watch?v=af78RPi6ayE
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25th November 2018, 08:36 | #15 | Link | |
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Continuum Noun: continuum (continua, continuums) A continuous nonspatial whole or extent or succession in which no part or portion is distinct or distinguishable from adjacent parts.
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I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ??? Last edited by StainlessS; 25th November 2018 at 09:20. |
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26th November 2018, 18:59 | #18 | Link |
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Not completely, and certainly not by using the peak cone response frequencies. And practicalities mean that the typical colours used in displays are a compromise. You can't replicate the deep violets you see in a sunset on a typical RGB display, for example.
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27th November 2018, 00:19 | #20 | Link |
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Lasers are great for exploring the limits of color vision, you can get a lot of pure colors that you cannot represent with any normal display (or normal objects). You don't usually see yellows or blues that color. A 473 nm laser is a cyan that is way outside what a normal display can do. It looks weird.
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