Adding Reds, Blues, Greens, Yellows, Etc to Paper

This page is the CodyCross answer for the clue below from Futuristic City , Group 984, Puzzle 1 (Digital Camera).

Question is: Adding Reds, Blues, Greens, Yellows, Etc to Paper

and the answer is: COLORING

Word Meaning:

COLORING — That colors something.

Definitions from Wiktionary.