Thread: Wikipedia?
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Old 03-05-2011, 09:27 AM   #7
nrapallo
GuteBook/Mobi2IMP Creator
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Quote:
Originally Posted by nrapallo View Post
Try reducing your images to 4 bit .png (optimzed) i.e. 16 colours (or .jpg/.gif if smaller), then recreate the ebook to see the file size savings...
I tried this with "Encyclopedia A.epub" which is 50.1 MB (52,606,545 bytes) and produced "Encyclopedia A_fixed16.epub" which is 23.5 MB (24,727,980 bytes), a 53% size reduction!

A few things I had to change (since I'm using a Western-world WinXP computer):
  • the file "Are_You_There_God?_Its_Me,_Margaret.html" was renamed "Are_You_There_God_Its_Me,_Margaret.html" as Windows didn't allow the quotation mark ("?") in the filename!
  • I reduced any image greater than 200x??? so that the short side was 200 using IrfanView and didn't enlarge smaller pictures nor used any dithering. For .gifs and .pngs, I just reduced the colors to 16 (4 bit) while with .jpgs I had better luck reducing the Quality to 70 than changing those images to .png or .gif! Any images less than 200x???, I didn't change the size, but did change the colors as above.
  • I edited all the text files (using notepad++ since it supports Unicode better than my trusty Textpad) to remove any width="???" or height="???" within <img > tags since I had reduced some image dimensions and didn't need/like them stretched back to their specified/original size.
Despite all these efforts, the file is too large to load for my epub reader so I couldn't test my creation thereon. However, it does load your "Encyclopedia 0-9.epub" (16MB) so it must be under some max. limit my Adobe Mobile Edition 9 doesn't support! I did preview that file using ADE (PC version).

P.S. it appears 16 color (4bit) .png images don't display properly on older versions of ADE (like the PC previewer I use), so I also prepared a 256 color .png version of "Encyclopedia A.epub" and called it "Encyclopedia A_fixed256.epub". This one added about 3MB and is 26.4 MB (27,690,600 bytes).

Quote:
Did you try to create a version without ANY images (just rename your images folder temporarily to another name) just to see the min. ebook filesize?
I tried it and for "Encyclopedia A.epub" it resulted in an ebook which is 4.63 MB (4,859,059 bytes); a 10-fold size reduction!

Last edited by nrapallo; 03-05-2011 at 10:54 AM. Reason: typo
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