One color used on photo to single out the subject from it. Colored objects in monochrome photography is like discover the right meaning of photo. In seconds we see what was on photographer’s mind, idea of photo is readable and clear for addressee. Those photos (if they good) are excellent for advertisement, web usage and important to contributors but almost all of them where computer manipulated to create such expression.
I find photo that really inspired me, colors are the background to almost white subject delicate chameleon excellent and beautiful in it simplicity.