RescaleOP - Setting Image Brightness

Is there any class which lets me set brightness to an image, preferably BufferedImage but it doesn't really matter, and then whenever desired remove the brightness. I have tried using RescaleOp, but it doesn't satisfy the latter criterion. When I have brightened the image, I can't seem to get it back to normal.

Java Code:

RescaleOp op;
if(image should be brightened){
float scales[] = {2f, 2f, 2f, 1f}, offsets[] = new float[4];

op = new RescaleOp(scales, offsets, null);
op.filter(getImage(), getImage());
}else{
float scales[] = {1f, 1f, 1f, 1f}, offsets[] = new float[4];

op = new RescaleOp(scales, offsets, null);
op.filter(getImage(), getImage());
} mh_sh_highlight_all('java');