So which file format IS best for my photos?

That’s a question I can’t answer, as I don’t know what you’re doing. But for Jonathan in Zurich, who asked about the PNGs with transparent backgrounds he just received from his photographer, I CAN answer.

He is used to getting PSDs, so when he got PNGs he was mystified, and send the question to see if this was okay.

Well, I don’t only answer his question about PNGs, we also look at JPGs and TIFFs, as well as PSDs, so see what’s going on with these four file formats we rely on for our printed products.