Fill color on specific portion of image?

Question

I want to fill specific color on specific area of an image.

EX:

Answer 1

Use the Github library below. The post uses the flood fill algorithm : UIImageScanlineFloodfill

Objective C description : ObjFloodFill

If you want to look at detailed explanation of the algorithm : Recursion Explained with the Flood Fill Algorithm (and Zombies and Cats)

few of the other tutorials in other languages : Lode's Computer Graphics Tutorial : Flood Fill