Photoshop lets you save the 16-bit per channel image in PNG? Which version? I know 7.0 doesn't.
Once you finished your processing (PSD preserves layers and other Photoshop internal information) I don't see any disadvantages except that 16-bit PNG is probably not as widely supported as TIFF. The advantage of PGN is very good lossless compression that gives you smaller file of any other standard format. For personal archive is a good choice. BTW, PNG is not Adobe's format. That's a public standard and acronym stands for Portable Network Graphics format. Cheers, Leon >-----Original Message----- >From: John Coyle [mailto:[EMAIL PROTECTED] >Sent: Saturday, June 04, 2005 8:46 AM >To: Pentax-Discuss >Subject: PSD v TIF v PNG > >Does anyone know of any disadvantages in saving processed >images in the Photoshop .PNG format? >I just worked on an image I want to keep at the best possible >quality, and compared the various file sizes as follows ( file >is a 30cm x 20 cm 16-bit RGB image in sRGB): >PSD file size is 303 MB >TIF-ZIP file size is 285 MB >TIF-NONE file size is 310 MB >TIF-LZW file size is 379 MB >PNG file size is 218 MB > >These are considerable variations in the volume of data >stored: all saves after the first conversion from .PEF (saved >as .PSD) were then taken from the .PSD file, and I am >concerned that image degradation will be permanently saved! >Although, of course, I can always go back to the .PEF file, >and a print from the PNG file looks fine. >All advice gratefully received - and followed! > >John Coyle >Brisbane, Australia > >
