Printing in is a darkroom technique used to control local shading in photographic prints. It involves giving additional exposure to specific areas of a print, often using a mask, dodging tool, or selective light, to brighten or enhance details that would otherwise appear too dark.
This technique allows photographers to refine the tonal balance, highlight important elements, and achieve a more visually pleasing composition. Printing in is a key skill in traditional printing methods, giving photographers precise control over contrast and detail in each section of the image.