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Is PPM a safe round-trip format to remove all metadata and transparency? I'd like to recommend it to a friend and as far as I know it really only contains RGB a
by Perseids 6y ago
Is PPM a safe round-trip format to remove all metadata and transparency? I'd like to recommend it to a friend and as far as I know it really only contains RGB as text and has no extensions for exif or similar. But after so many gotchas, as listed here in the thread, I'm somewhat paranoid...
- jstanley 6y agoASCII PPM supports comments, so it is possible that EXIF or other identifying information would get written into the comments by some tool. I have only ever observed PPM comments right at the start of the file, so you could open it in a text editor and remove the comments from the start. Maybe check the very end of the file as well. Binary PPM does not support comments, so that would be a better solution. PPM documentation here, you want possibly P3 or more likely P6 https://en.wikipedia.org/wiki/Netpbm#File_formats https://en.wikipedia.org/wiki/Netpbm#File_formats