Color mixer

[Furtbichler]

Are you lazy? Blend Color1->Color2, then Color2->Color3 etc.

[WojTec]

I don't understand you, what I need to blend with?

[Medium]

He means that you simply need to string pairwise blended colors together. That's the common way of doing it, and most probably also the by far easiest, especially if you have gradients for two colors already implemented (since it's the same thing, just done a few times in a row).

[WojTec]

When I'll blend red and magenta (above image) I'll get RGB(255, 0, 127), this color isn't in example output. So, I still don't understand what I need to blend?

[Medium]

Ah! You don't want to blend with multiple preset colors in between, but using a different color model I suppose! The above looks like the blending was done in HSV or HSL space. (Don't know if right- or left-handed hue, but that should be simple enough to try out.) So instead of blending using RGB, just do it in HSV/HSL. That should get you pretty close to the above result.

[WojTec]

RGB(255, 0, 0) = HSL(0, 100, 50)
RGB(255, 0, 255) = HSL(300, 100, 50)
add H/S/L values and divide by 2
result HSL(300, 200, 100) = RGB(0, 255, 128)
result is similar to color 3 in sample

Is this good way? Ah, I don't think so

[Medium]

Well, there is a multitude of possible ways to tweak this. And since we do not know where your sample came from, if you need to reproduce it exactly and how your original reference actually does it, we can merely try and try and try to get closer to it step by step. With only one sample and no way to see what other border colors should produce, this is as far as it gets - at least if we exclude further utter guesswork.

[Medium]

I just saw, that my HSL idea could still work, since you made an error in your example:

RGB(255, 0, 0) = HSL(0, 100, 50)
RGB(255, 0, 255) = HSL(300, 100, 50)
add H/S/L values and divide by 2 you forgot the latter
result HSL(300150, 200100, 10050) = I don't have a converter handy, but I am pretty confident, that this will look a lot more like what you want