Hi again, thanks for all your help. You guessed right, Im using a digital camera and cant shoot a tif or raw file, as it is to large and takes to much time to save. Ill try some of the mentioned software. @zhounder: Though in the JPEG Standard a lossless JPEG compression is defined, every jpeg compression with Photoshop (Version 6) is lossy... this is what I tried before. Im not sure about version 7, but the original handbook always talks about lossy compression in connection with JPEG. Thanks a lot!