Compare RGB colors in c#

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What you are looking for is called Delta-E.

http://www.colorwiki.com/wiki/Delta_E:_The_Color_Difference

It is the distance between two colors in LAB color space. It is said that the human eye cannot distinguish colors below 1 DeltaE (I find that my eyes can find differences in colors below 1 DeltaE, each person is different.)

There are 4 formulas for ‘color difference’.

  • Delta E (CIE 1976)
  • Delta E (CIE 1994)
  • Delta E (CIE 2000)
  • Delta E (CMC)

Check the math link on this site:

So the proper answer is to convert your RGB to LAB using the formula given, then use DeltaE 1976 to determine the ‘difference’ in your colors. A result of 0 would indicate identical colors. Any value higher than 0 could be judged by the rule ‘A delta e of 1 or less is indistinguishable by most people’.

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