Glossary
Push and pull processing
Also called: push processing, pull processing
Developing film longer or shorter than rated, to change effective ISO.
Pushing means rating film higher than its box speed (say, Tri-X 400 shot at 1600) and compensating by developing longer. The result is more grain, more contrast, and you got two stops of effective ISO. Pulling is the opposite: rate film lower and develop less, for a tamer image. The app's stock database knows the development time changes for each push/pull stop on common stocks.