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Old 09-24-2007, 12:44 PM   #183
ereszet
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Whitespace removal

Quote:
Originally Posted by cacapee View Post
Fixing white space marks can be done by using the Trim% feature. Click preview and move the left, top, bottom, right markers so that you crop out what you don't need. You don't have to be very accurate since pdflrf's whitespace removal takes care of the rest.
It is a great feature of pdflrf but it will not work with book pages whose margins change from page to page (like a lot of them available in digital libraries or in photos taken without a cradle and a tripod). In addition, white space removal (another magnificent feature of pdflrf) will not work with whitespace stained by black spots or blobs. You get a lot of them in photos of old books or if you split double pages in two (black/gray shadow in the middle of the original photo becomes black/gray shadow at the margins of the resulting two pages. It shows as black lines/blobs after converting to black and white. So a number of books require preprocessing before going to pdflrf. I will post my experience with that at a later stage, if you believe that my Software Tool theme belongs to this thread.

BTW. I take my photos with the black background, so I use programs to remove black background first and whitespace after that.
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