I understand that my .NEF (Nikon) Raw files come into PS via Camera Raw. I understand that after working on my files it's a good idea to save as PSD to preserve layers. I understand I can eventually save JPGs to use them in various arenas. My question is this: Can I get a quick explanation of what I should know about .PNG, .TIF, .DNG and maybe others regarding how they relate to my Photoshop adventures? Are some to be ignored? Are there some major advantages associated with other formats? Thanks much!