imsubtract(data(:,:,1), rgb2gray(data));

Hey people: i know that this instruction imsubtract(data(:,:,1), rgb2gray(data)); will subtracts the red color...with green i have to change like that imsubtract(data(:,:,2), rgb2gray(data)); and with blue imsubtract(data(:,:,3), rgb2gray(data));...but what about if i want to subtract yellow black or other color?

Answer 1

[Image Analyst]

You can subtract any RGB image from any other RGB image. Just do that. I don't recommend using imsubtract. Just cast to double, subtract, and continue on.

differenceImage = double(rgbImage) - double(yourImageWithYellowInIt);