Quote:
Originally Posted by j.p.s
That is a taller image than any current reader screen, yet the number of bytes almost meets the oldest file size restriction, while the JPEG is 5 times larger. So quite high quality line drawings can require few bytes as PNG.
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Unfortunately, the older Mobi format (not sure about AZW3) didn't support PNG, and IIRC, also auto-converted everything to GIF internally unless you told it otherwise, so that probably complicated matters.
But yeah, people often don't know when to use PNG versus JPEG.
Quote:
Originally Posted by j.p.s
Doesn't Amazon continue to restrict total file size for the lowest priced books because of data transfer costs and even deduct data transfer fees from royalties for higher priced books that have large file sizes?
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I don't know if they still do, but certainly at one point, people were using the KindleStrip utility in the Kindle Formats forum to cut down their filesize by removing the added sources in the files they got from using KindleGen.
Well, at least with public domain books, if one is sufficiently motivated, the original scan sources (or a reasonable alternative) can usually be found and cleaned up to upgrade disappointing files.