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The file was already portrait. I tried a similar file with only 20 pages: 600K with 4 colors, 400K with 2 colors. I don't expect adding extra PNG processing is going to save more than 20% on file size.
Original PDF file size was 130K for the 20-page file, and 7500K for the 3300-page file. Both had embedded fonts. The 20-page file increased in size by a factor of 5, the 3300-page file by a factor of 13. Not sure why the uncrease is size was different in each case, as settings were the same.
Is there any way to disable dilation and resizing in order to keep fonts cleaner? Without using 4 grayscale levels, the resizing after dilation resukts in significantly messier characters. I'm not sure if the Reader does antialiasing of fonts internally utilizing the grayscale capability of the display.
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