to create highlights in (a photograph or engraving).
noun
3.
Also, high light.an important, conspicuous, memorable, or enjoyable event, scene, part, or the like: the highlight of his talk; the highlight of the concert series.
4.
the area of most intense light on a represented form, as in a painting or photograph.
1658, originally of paintings, "the brightest part of a subject;" fig. sense of "outstanding feature or characteristic" is from 1855; the verb is from 1934.