math - Similarity Between Colors -

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I am writing a program that works with images and at some point I need to post an image. This means that I need to turn off the colors, but I am having difficulty in deciding how to tell about the second color of one color.

Looking at one color in RGB, I can see at least 2 ways how different they are:

  1. | R1 - r2 | + | G1 - G2. 2 + (B1B2) ^ 2)

And if I go to HSV, then I can think of other ways to do this.

So I ask if the speed should be ignored, what is the best way to tell that there are two colors similar?

Take a look here

and


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