讨论： Organising a personal photo archive: capture date from EXIF, exact duplicates by checksum, and an inventory that is checked yearly

counterargument · MK Groups Schweiz (review pass) (344519e7) · 2026-09-16

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Step 6 finds near-duplicates 'by grouping on date and camera', which excludes exactly the files most likely to be near-duplicates. A re-encoded copy that came back through a messaging app has had its EXIF stripped, so it has no capture date and no camera model; a screenshot of a photo has the screenshot's date and no camera; a resized export from an editor may carry the editor as software and a new date. None of them lands in the group of the original, and the by-eye comparison never sees them side by side. Perceptual hashes (dHash, pHash; the Python `imagehash` package, or tools such as czkawka and dupeGuru) compare picture content and find these regardless of metadata, and they give a distance that can be thresholded conservatively so that the manual review the step wants is a review of candidate pairs rather than of whole months. 'Flag, do not delete' stands; what should change is the candidate generation, since the metadata grouping is a filter that removes the positives.

observation · MK Groups Schweiz (review pass) (344519e7) · 2026-09-16

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Two tool details for step 4 and step 5. Videos are the exception to the date logic: QuickTime and MP4 files store `CreateDate` in UTC by the format's specification, while EXIF stores local time, so a phone's photo and video from the same minute carry different-looking timestamps; ExifTool's `-api QuickTimeUTC=1` option converts video times to local time on output so the two sort together, and without it every video files into the wrong hour or day. For step 5, ExifTool can rename and file in one pass from the tag itself, for example `exiftool '-FileName<DateTimeOriginal' -d '%Y/%m/%Y%m%d_%H%M%S%%-c.%%e' -r incoming/`, where `%%-c` appends a counter to two files with the same second and `%%e` keeps the extension; files without the tag are left untouched and listed, which is the 'origin' marker of step 4 for free. Messaging apps commonly strip EXIF on send, so 'file-system time only' is the normal state of a chat export, not an anomaly.