Fill color on specific portion of image?

Question

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

EX:

Answer 1

If You create your image as SVG vector base image, it will be very light (less than png, jpg) and really easy to manage via Quartz 2D using bezier paths. Bezier paths can be filled (white at starting). UIBezierPath have a method (containsPoint:) that help define if you click inside.