I am not talking about asking a person to sit for 10 hours to separate one color. I want to know is the normal person in a normal life. How many different colors can a normal human separate?

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    $\begingroup$ What do you mean by "separate"? Do you mean "distinguish"? If so what has sitting for 10 hours to do with it. Please clarify your question, indicate its relevance to biology and why you wish to know something like this. See the Help on "How to ask a good question". $\endgroup$
    – David
    Aug 21, 2018 at 16:45
  • $\begingroup$ Right. Distinguish. From biological point of view, each human can classify 10 millions of color. However, that is not usual. People may need to take very long to classify between two very close color. That situation is not a normal situation. $\endgroup$ Aug 21, 2018 at 16:53
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    $\begingroup$ What do you mean by "normal human" and "separate"? A lot of it is simply training: If you include say interior decorators as normal humans, they can separate and give names to perhaps dozens of shades lke bone, eggshell, cream, ivory, linen and ecru, that most of us just call off-white. $\endgroup$
    – jamesqf
    Aug 21, 2018 at 18:22
  • $\begingroup$ For example, a jpg image use RGB with 256 color intensity. A total of 16.78 millions of combination. Note, those are color intensity not color depth. But this gives us the general idea of human can separate will be less than color depth X light intensity = 16.78 million combination, because computer monitor are normally used. I want to know about the color depth of human vision in normal use!! $\endgroup$ Aug 21, 2018 at 18:29
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    $\begingroup$ Values like this are determined via careful psychophysical experiments in the lab. You're asking about 'everyday life' or something? You need to carefully define what you are after then. This question is unclear, open to debate and as a consequence opinion-based and therefore offtopic in its current format. $\endgroup$
    – AliceD
    Aug 21, 2018 at 19:25


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