I'm using Canon's DPP to do some post processing on RAW files with my macbook unibody. After getting all the adjustments done and converted to jpeg, I use the mac's image viewer to view the output file. For some reason it always turns out darker that the adjusted photo on the DPP viewer. I knew it wasn't screen calibration issues but I went ahead and did it anyway. This also applies to Gimp. After working on an image, the image viewer is still darker. I have a screenshot that shows the huge difference but I would have to wait until I get home to add it. I just wanted to see if others have the same issue.