leveraging http://www.tmsu.org/:
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easily (mass)-tag images, i.e. from a program like gqview or geeqie.
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generate albums in a cheap reproducable way by basically configuring a match expression (tags to match and not match) per album
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mtmsu: manage the tmsu database from the mountpoint of the current directory
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ltmsu: manage the tmsu database from a .tmsu which is above the current working directory