I recently stumbled on an interesting short essay by Sarah Coleman, Magnum and the Dying Art of Darkroom Printing describing the work of Magnum and the darkroom printer. The above example is by Bob Henriques of Henri Cartier-Bresson considering how best to photograph Dr Martin Luther King Jnr, detailing to the printer where to dodge and burn.
Darkroom printing by journalistic documentary agencies like Magnum Photos is/was a highly skilled job. We still do something similar, visually, more easily, but perhaps with less thought, using digitally graduated filters in Lightroom or Photoshop.
Sarah’s web site, The Literate Lens, has many interesting essays that investigate connections between photography, art and literature. Worth exploring.