It's just seeing - at least the photography I care about. You either see or you don't see. The rest is academic. Anyone can learn how to develop. It's how you organize what you see into a picture.
Interviews With Master Photographers : Minor White, Imogen Cunningham, Cornell Capa, Elliott Erwitt, Yousuf Karsh, Arnold Newman, Lord Snowdon, Brett Weston by James Danziger