This exactly, couldn't have said it better myself!Lithrael said:That's not exactly what he means. Most published black and white manga itself is composed for and meant to be in black and white. Any art Miura intends to be in color will have different techniques, rules of composition etc, from all the way back in the sketch phase that work intended to be in black and white. Coloring any black & white manga by a good artist who did not intend to leave some of the visual work to a colorist, is more for fun and to see what you can do than ever an improvement on it.
For a counter-example, you can really do great stuff with black and white Mœbius art because most of it was composed with the idea in mind of maybe going back and doing watercolors later.