Finding the closest color

[njsokalski]

I am relatively new to AForge and image analysis, so maybe there is an easy way to do this that I am unaware of. I am writing an app to scan a simple card that has a 5x5 grid of colored squares, each of which is one of 4 colors (red, blue, tan, black). Once I have found a blob for each square (which is obviously a topic for it's own thread), I plan on determining the color based on the ColorMean property of the blob. However, because the ColorMean will rarely 100% match any of the colors exactly, I need to figure out which one is closest. Does anybody have any suggestions on the most efficient way to do this? Thanks.

[andrew.kirillov]

For example, Euclidean distance between the found mean color and those colors in your data set. Pick the one which gives the smallest distance.