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Kovid - I noticed this change in the pipeline ==>>
Allow reading more image formats as covers
Will this include TIFF files? If it does, perhaps the image type list could be user configurable, exclusions via a tweak would be best for me.
Some of the 'books' in my _Main library have a large multi-page Baseline TIFF file containing one or more diagrams. Comic book formats are not an option, firstly because some of the books already have a CBZ file, and some of the TIFFs can only viewed effectively with Fast Image Viewer or something similar.
And for my _Media library, I've been thinking of migrating the image urls I currently have in custom comments to multi-page TIFFs. This would overcome the annoyance of having the images flash up as 'tooltips' in the book list, and it would move the images into the library folder - which is arguably where they belong. Again comic book formats are not an option, in this case many of the books already have a CBZ.
BR