How to change the colors of a PNG image easily? [closed]

Question

I have PNG images that represent playing-cards. They are the standard colours with Clubs and Spades being blank and Diamonds and Hearts being red.

I want to create a 4-colour deck by converting the the Clubs to green and the Diamonds to blue.

I don't want to re-draw them but just changing them by hand seems a lot of work since the colours are not all "pure" but graded near the edges.

How do I do it?

Answer 1

Photoshop - right click layer -> blending options -> color overlay change color and save

Answer 2

This should be fairly straightforward in the gimp http://gimp.org/

First make sure your image is RGB (not indexed color) then use the "color to alpha" feature to turn the clubs/diamonds clear, then fill or set the background or whatever to get the color you want.