Thread: FREE/BARGAIN — Science Fiction & Fantasy
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Old 07-04-2025, 01:25 PM   #9323
j.p.s
Grand Sorcerer
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Quote:
Originally Posted by salty-horse View Post
Here's an illustration from the Earthsea book from The Verge's article:
Books_of_Earthsea_plate.jpg - it's a 1692x2508 pixel JPEG, almost 5MB.
In the Kobo ePub, it's a 676x1045 pixel JPEG, 200kb.
Thank you for the details.

What is the file size of the EPUB and how many total illustrations? I don't think there are many, if any, commercial ebooks with multiple 5MB images and 5MB seems excessive for 1692x2508, which would be only 12.7MB for an uncompressed 24bit/pixel image.

I did
Code:
djpeg Books_of_Earthsea_plate.jpg | cjpeg > Books_of_Earthsea_figure.jpg
and the result was 834KB and don't notice any change switching between them, but I think reducing the dimensions to 676x1045 and especially compressing to 200KB would significantly degrade the quality.

But the amazon versions are probably worse except maybe those directly delivered to a tablet.
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