The crop tool is a key feature in image editing software that enables users to remove unwanted areas from an image. It helps improve composition, emphasize subjects, and change aspect ratios. 

In typography, cap height refers to the height of the uppercase letters (capital letters) in a typeface. Specifically, it is measured from the baseline (the line upon which most text sits) to the topmost point of flat uppercase letters, excluding any ascenders or diacritics. For example, in the letter "H," the cap height would be the distance from the baseline to the top of the "H."

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