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Kovid Goyal 2011-01-08 07:27:08 -07:00
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src/calibre/manual/conversion.rst
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@ -533,17 +533,22 @@ PDF documents are one of the worst formats to convert from. They are a fixed pag
Meaning, it is very difficult to determine where one paragraph ends and another begins. |app| will try to unwrap Meaning, it is very difficult to determine where one paragraph ends and another begins. |app| will try to unwrap
paragraphs using a configurable, :guilabel:`Line Un-Wrapping Factor`. This is a scale used to determine the length paragraphs using a configurable, :guilabel:`Line Un-Wrapping Factor`. This is a scale used to determine the length
at which a line should be unwrapped. Valid values are a decimal at which a line should be unwrapped. Valid values are a decimal
between 0 and 1. The default is 0.5, this is the median line length. Lower this value to include more between 0 and 1. The default is 0.45, just under the median line length. Lower this value to include more
text in the unwrapping. Increase to include less. You can adjust this value in the conversion settings under PDF Input. text in the unwrapping. Increase to include less. You can adjust this value in the conversion settings under :guilabel:`PDF Input`.
Also, they often have headers and footers as part of the document that will become included with the text. Also, they often have headers and footers as part of the document that will become included with the text.
Use the options to remove headers and footers to mitigate this issue. If the headers and footers are not Use the options to remove headers and footers to mitigate this issue. If the headers and footers are not
removed from the text it can throw off the paragraph unwrapping. removed from the text it can throw off the paragraph unwrapping.
Some limitations of PDF input is complex, multi-column, and image based documents are not supported. Some limitations of PDF input are:
Extraction of vector images and tables from within the document is also not supported. Some PDFs use special glyphs to
represent double ll or doubfle ff or fi,etc. Conversion of these may or may not work depending on jusy how they are * Complex, multi-column, and image based documents are not supported.
represented internally in the PDF. * Extraction of vector images and tables from within the document is also not supported.
* Some PDFs use special glyphs to represent ll or ff or fi, etc. Conversion of these may or may not work depending on just how they are represented internally in the PDF.
* Some PDFs store their images upside down with a rotation instruction, |app| currently doesn't support that instruction, so the images will be rotated in the output as well.
To re-iterate **PDF is a really, really bad** format to use as input. If you absolutely must use PDF, then be prepared for an
output ranging anywhere from decent to unusable, depending on the input PDF.
Comic Book Collections Comic Book Collections
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