yep make sure to save it as a BMP or TIFF or a PSD file never ever ever use the JPG option . It has way to much Loss in it . I try to make my render size match a print size or screen/ monitor size incase i wish to print it at a later date . If you want to compress it wait till the very last thing you do to convert it to a JPG . My typical render size is 1600 x 1200 and i make both my view size and render size the same .