Touchup vs Retouch - What's the difference?

As nouns the difference between touchup and retouch

is that touchup is an alternative spelling of touch-up while retouch is the act of retouching.

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

(en noun)

* {{quote-news, 2009, February 1, Dakota Lane, Elaine Griffin and Michael McGarry, New York Times citation

, passage=But she dabbed at an eye, cried out for a touchup and had someone turn up Grace Jones on the MP3 player. }}

(es)

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

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

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

(es)

The act of retouching.