retouching

/R IY0 T AH1 CH IH0 NG/
verb
  1. 1

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

  2. 2

    To colour the roots of hair to match hair previously coloured.

  3. 3

    To modify a flint tool by making secondary flaking along the cutting edge.

noun
  1. 1

    A retouch.

Source: https://en.wiktionary.org/wiki/retouch, https://en.wiktionary.org/wiki/retouching