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I'm also interested in the information lost when compressing to PNG over TIFF, considering PNG is lossless, and TIFF out of a scanner also. ICC Profile are embedded, 24bit depth color so for quality and color, it's the same as TIFF.

To edit image also it's perfectly fine, in my opinion, to load the PNG in Photoshop then save in PSD for all the edition you might add ( Vector, Layer )