RGB colour pixel plot

I should plot pixels' of interest RGBs on the Maxwell's color trangle. If not immediate solution (which needs new code creation), then at least plotting single pixels RGBs line by line in the ASCII .txt file is desired. Even better if not a single pixel but manually defined area might be provided. Thanks, Oleg Orlov, [e-mail] Moscow.

Answer 1

[Image Analyst]

Try plot() and fprintf(). I've attached some masking demos.