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List:       imagemagick-user
Subject:    Re: [magick-users] help with converting pbm to png
From:       Wolfgang Hugemann <Auto () Hugemann ! de>
Date:       2010-10-29 5:04:20
Message-ID: 4CCA55D4.1010600 () Hugemann ! de
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Terry,

I regularly use pdfimages to losslessly extract images from PDF files 
and and the convert these PBMs to TIFFs or GIFs with ImageMagick. 
Although using various versions of IM, I have never encountered any 
problems with that. I have just tried to use PNG instead of GIF and have 
met no problems with doing so.

Considering your PDF: Extracting the images with pdfimages, I get the 
same results as you. But I meet no problems when converting them to 
PNGs; they look just the same as the originals.

BTW: PNG does a much better job on compression than TIFF (and even GIF), 
so perhaps I should switch to PNG in the future...

At the moment I'm using ImageMagick 6.6.3-0 2010-07-01 Q16 on Windows XP 
and Windows 7, 32 bit.

Perhaps this is a problem with the very IM version you use, check with 
http://www.imagemagick.org/script/changelog.php.

Greetings from Germany
Wolfgang Hugemann
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