Posters are often folded rather than rolled up in order to make transportation easier. When unfolded, a white line a appears in the scan where the crease/fold originally was. This fault also refers to the fold in the middle or edge of an image when the original book or magazine was not unbound, or any signs that the original page was not placed flat on the scan bed.

The tag refers to posts with staples in them, such as post #65973 since they are fixed the same way as creases.

Creases can be fixed by unbinding books, and some photoshopping.

Examples:

Updated by Aurelia almost 15 years ago