Can anyone explain to me the advantages/disadvantages of using tiff vs. psd format for saving files in photoshop? These are very large files that I'll be working with (200-300 meg) and in tiff format they seem to save quite a bit larger than psd. As long as the end image quality is the same, I'd prefer to save as psd for space saving concerns. Any thoughts on the downside of using psd format? Thanks in advance.