In photography and printing, register refers to the precise alignment of multiple images, layers, or colors when they are overlaid. Maintaining accurate register ensures that all elements line up correctly, preventing blurred edges, color misalignment, or ghosting effects.
Register is particularly important in multi-exposure photography, film printing, and digital compositing. Photographers and designers rely on proper register to achieve sharp, professional-quality images, whether combining exposures for creative effects or ensuring accurate color reproduction in printed materials.