PNGj: Row writing order

The purpose is to draw a small image inside another image at some specified area. Is there any possibility to change only specified rows and avoid rewriting of entire lines of the origin image? I …

Crop image to smallest size by removing transparent pixels in java

I have a sprite sheet which has each image centered in a 32×32 cell. The actual images are not 32×32, but slightly smaller. What I’d like to do is take a cell and crop the transparent pixels so the …