retouch

verb

1. (transitive)To improve something (especially a photograph), by adding or correcting details, or by removing flaws.

   “For time ſhall with his ready pencil ſtand; Retouch your figures with his ripening hand; Mellow your colors, and imbrown the teint; Add every grace, which time alone can grant; To future ages ſhall your fame convey, And give more beauties than he takes away.”

2. (transitive)To colour the roots of hair to match hair previously coloured.
3. To modify a flint tool by making secondary flaking along the cutting edge.

noun

1. The act of retouching.