so I have some images(BMP format) where there are some numbers. I want to change the numbers' colour. the problem is that I can't understand how this thing works. I've searched on the internet and found a function GetPixel (int x, int y) that is supposed to help me change the pixel's colour, but I don't understand how it works because when I try to use it..it isn ' recognized. can someone please help me understand how can I change a pixel's colour?