@kovidgoyal
Thank you for your response - I am aware of the Polish tool and have been using it so far (I should probably have mentioned that). For many of my big-size books (e.g. travel guides) I can reduce them to half with lossy 'Compress images' and I see no difference in the images. I reckon I can reduce my Calibre database significantly but it is tedious to do one by one...
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