I'm at the stage of my project where I'm going to be generating images from the TIFF master copies, for web-display, and I'm of course looking at PNG vs JPG. At this point in time, does PNG support all the same metadata that JPG does as far as EXIFTool is concerned, or is it still safer to go with JPG as the IPTC/XMP-tagged web display version?
ExifTool supports EXIF, IPTC and XMP in PNG images, but most applications will only recognize XMP in PNG (if you are lucky). So if XMP alone isn't sufficient, and interoperability is important to you, then you should use JPEG.
- Phil