I have an image that I need to split into multiple color channels--not just RGB, CMYK, or HSL.

I believe this is possible because I have a sample image to which this has been done---I have the original image, plus about 8-10 separate greyscale images that, individually contain the info for all the diff colors in the image. (Obviously done by someone else, unknown to me---I rec'd it as a sample for what needs to be done to my design.)

Can anyone advise me on this or point me to a tutorial? I've looked everywhere.

Thanks so much!