Question

I am working with 24×24 pixel icons. And I would like to be able to change a specific color within this icon to a different color. For example turn the white areas to red.

Answer 1

I don’t know of an API method that does that. And by default, Images are not writable. However, if you have a BufferedImage, you could do it like this:

public void changeColor(BufferedImage img, Color old, Color new) {     final int oldRGB = old.getRGB();     final int newRGB = new.getRGB();     for (int x = 0; x < img.getWidth(); x++) {         for (int y = 0; y < img.getHeight(); y++) {             if (img.getRGB(x, y) == oldRGB)                 img.setRGB(x, y, newRGB);         }     } } 

This is not the most efficient way to do it (it’s possible to fetch RGB data into an array instead of one pixel at a time), but for 24×24 images it shouldn’t be a problem.