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kovidgoyal · 08-03-2023, 09:38 AM

Look at the implementationof rescale_images() in fetch/utils.py you will see it works by using a compression_quality parameter which is decreased in steps to get the desired file size. There is no such parameter in PNG since it is a lossless format.

08-03-2023, 09:38 AM	#2
kovidgoyal creator of calibre Posts: 45,414 Karma: 27757236 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Look at the implementationof rescale_images() in fetch/utils.py you will see it works by using a compression_quality parameter which is decreased in steps to get the desired file size. There is no such parameter in PNG since it is a lossless format.