Just spotted that Tim is busy working on something that I dabbled with last February:
I'm actually in the midst of revisiting my code, as I want to automate a way of locating visually similar images from the "1000 Frames of Hitchcock" project, e.g.:
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Anyway, today seemed like a good opportunity to return to Ed Vielmetti's original question about sorting books into the colour of a rainbow…

[...] Pattern up in Huddersfield has reminded me that he has already done some work on identifying colours in book jackets and then retrieving them [...]