Check out example codes for "change brightness of image in java". It will help you in understanding the concepts better.

Code Example 1

float scaleFactor = 1.3f; // How much brighter. 1.3 means 30% brighter
RescaleOp op = new RescaleOp(scaleFactor, 0, null);
bufferedImage = op.filter(bufferedImage, null);

Learn ReactJs, React Native from akashmittal.com