I\'m trying to find a way to compare two colors to find out how much they are alike. I can\'t seem to find any resources about the subject so I\'m hoping to get some pointer
Colour perception depends on many factors and similarity can be measured in many ways. Just comparing how similar the R, G and B components are generally gives results humans won't agree with.
There's some general material on colour comparisons in wikipedia, and on working with natural colour spaces in C# in this question.