Adjust brightness and contrast of BufferedImage in Java

Question

I'm processing a bunch of images with some framework, and all I'm given is a bunch of BufferedImage objects. Unfortunately, these images are really dim, and I'd like to brighten them up and adjust the contrast a little.

Something like:

BufferedImage image = something.getImage();
image = new Brighten(image).brighten(0.3); // for 30%
image = new Contrast(image).contrast(0.3);
// ...

Any ideas?

Answer 1

That was easy, actually.

RescaleOp rescaleOp = new RescaleOp(1.2f, 15, null);
rescaleOp.filter(image, image);  // Source and destination are the same.

A scaleFactor of 1.2 and offset of 15 seems to make the image about a stop brighter.

Yay!

Read more in the docs for RescaleOp.