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target

n. ~ 1. A benchmark used for testing and calibrating optical and reproduction systems. - 2. Microfilming, Imaging · A document, added to materials before being imaged, that provides information about the materials.

Notes: 

Targets1 often contain graphic patterns, such as a series of progressively closer parallel lines, used to test for resolution and astigmatism. A gray scale or color tablet may be used to match the tonal range and colors in the reproduction with the original. - Targets2 often contain information that describe the materials, problems with the originals, missing materials, or the filming process.