Invert bitmap colors

Question

I have the following problem. I have a charting program, and it\'s design is black, but the charts (that I get from the server as images) are light (it actually uses only 5 colo

Answer 1

If you have it available as BufferedImage, you can access its raster and edit it as you please.

WritableRaster raster = my_image.getRaster();

// Edit all the pixels you wanna change in the raster (green -> red, pink -> green)
// for (x,y) in ...
// raster.setPixel(x, y, ...) 

my_image.setData(raster);