Easy way to change icons color in sprites

Question

I have a set of blue icons in sprite png, is there an easy way to change the color of each icon using a tool like Paint.net
What I've tried so far is changing pixels color one by one, but it's really troublesome

Answer 1

You can use Photoshop to swap certain colors with colors of your choice. This way, you have more control, as you can replace each shade separately.

Answer 2

I've juste found an answer : https://stackoverflow.com/a/6059779/288387

Use Photoshop, Paint.NET or similar software and adjust Hue.