Going through every pixel of an image and finding the color that correlates with it

I am trying to write a function that goes through every pixel of an image and find the colors associated with the pixels. I also need to remember the number of pixels associated with the color red.

How do I know how many pixels are in an image and how do I map the [x,y,z] relationship with the color of the pixel??

Thanks

Answer 1

[Walter Roberson]

There is no standard about where "red" ends and some other color begins.

You might want to see the file exchange contribution for fuzzy color matching.