add photos sorting article

articles/photos_sorting.md

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+---
+title: How to sort multiples photo directories
+date: 2020-05-15
+---
+
+Too many backups
+----------------
+
+I have a bad habit of fearing losing data, and making a hasty backup when I need
+to change machines. Since it's always laborious to compare a directory of photos
+with what I already archive, I usually backup the whole directory to deal with
+it later.
+
+After a few months (sometimes years), I end up with many backup directories.
+Some images are duplicated across these directories, with various sizes and
+naming. This make the task of archiving even more difficult.
+
+I recently had to do it and I created some tiny utilities that made this task
+much easier. Let's dig in!
+
+Proper naming
+-------------
+
+The first thing to do is to properly name an image. I chose the format
+`year-month-day_hour-minutes-seconds.ext`, eg. `2020-05-15_14h30m05s.jpg`.
+Usually this data is available in the photo
+[Exif](https://en.wikipedia.org/wiki/Exif). You can extract it with
+[exiftool](https://exiftool.org/).
+
+For instance you can create a small script named `rename-exif-date`:
+```sh
+#!/bin/sh
+# Rename wrt date and hour of shot: 2020-12-25_20h03m12s.jpg
+exiftool -d %Y-%m-%d_%Hh%Mm%Ss%%-c.%%le "-filename<CreateDate" "$@"
+```
+
+And run it with [fd](https://github.com/sharkdp/fd):
+
+`> fd -t f -x rename-exif-date {}`
+
+That will rename all your files.
+
+Detect thumbnails
+-----------------
+
+If you have thumbnails cluttering your directories, you can detect and remove
+them with [feh](https://feh.finalrewind.org/).
+
+To remove files smaller than 300x300, create a script name
+`remove-small-images`:
+
+```sh
+#!/bin/sh
+feh --recursive --list --max-dimension $1 --action 'rm %F'
+```
+
+`> remove-small-images 300x300`
+
+Detect duplicates
+-----------------
+
+Now you should have clean directories, but potentially full of duplicates.
+
+The tool I recommend to detecting (and removing) them is
+[dupeGuru](https://dupeguru.voltaicideas.net/).
+
+It can detect perfect duplicates (basically the same file), or similar images
+with a similarity threshold based on the content.