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An increasing number of image editors are focusing on “non-destructive editing” too…

• alpaca128 4y ago
  That's true, but the information for that is usually stored in the image editor's own format, not in the exported image file.
  • TeMPOraL 4y ago
    Except when we're talking mobile apps. Samsung apps have a penchant for producing... enriched files in common formats. For example, "motion photo" feature I used few years ago would give you perfectly normal JPG file that also happened to store a short video. Nothing I know other than Samsung phones can read the video part directly, though there exists desktop software that can extract it and save as separate video file. More recently, I've noticed photo editor tools on Samsung phones allow you to undo previously made edits on an already saved file, including any destructive crops and transforms - meaning the original is being persisted somewhere. I haven't checked where, but I imagine it's again attached to the back of the JPG you thought you've cropped/redacted. Somewhat related: PlantUML. It's a tool for generating diagrams from plaintext descriptions. One of its most interesting, if not well-known, features is that it saves "editable PNGs" by default - that is, PNGs it produces have the plaintext diagram code attached to the image as metadata. Seems mostly harmless, but it could technically leak information you put in the diagram code but made not visible in the image.