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Old 12-21-2010, 04:33 PM   #2
Starson17
Wizard
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Quote:
Originally Posted by jordan13589 View Post
When I transfer a pdf that is mostly text to a .mobi, and I then need to make the text bigger on the kindle to read the new .mobi file, it works fine.
It's likely this is a text-based pdf. They convert OK in Calibre.

Quote:
However, when I try to use calibre to make a .mobi file out of a pdf that has images throughout the text, or a pdf with multiple columns of text, the new .mobi file loses its ability to change text size when on the kindle; when I try to change the text size, the pdf image remains as a full page and won't change in size.
At this point, Calibre can't handle multiple column pdfs. Conversion will fail if it's a text-based multi-column pdf. If it's an image based pdf, conversion will succeed, but you'll only get images of pages full of text, so no text size management is possible. I can't be sure, but I suspect you are confused between image based pdfs (images of pages having text that look like text but are really pictures of text) and text-based pdfs. In the former, your pdf is just pictures. Only the latter has text that can be controlled with text size options.

When pdfs have both true text and graphics, conversion will work, but image placement relative to the text is often lost.

I suspect that this has nothing to do with whether the pdfs have graphics.

Quote:
The only other option I am aware of is to keep them as pdfs and read them as is on the kindle. I prefer not to do this, though, as I find pdfs difficult to read and rarely worth the effort.
I don't have a kindle, but I have the same issues with pdfs. Some are scanned page images of text, and some are true text. Only the latter type can be converted to other formats with any success.

Quote:
Is there any way to change the calibre instructions or directly alter the pdf so that the new .mobi file will have a pdf with images and will still change text size?
OCR the text images to convert to true text, then convert that.

As to your questions about images on the kindle, I can't help you at all.
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