Crop marks show where a page, photo or transparency is to be cut. Crop marks determine which sections of a photo or transparency should be reproduced when only part of the original image is desired.
Marks that indicate where an image of a page is to be trimmed.
Identifying marks that show where a crop should occur. Crop marks are becoming synonymous with "trim marks" that show where excess paper will be trimmed away, even if a photo is not involved.