[magick-users] Problems generating Thumbnails from PDF

[Ruediger Kern]

Dear list,

we encountered some problems generating thumbnail JPGs from PDF-files.
Unfortunately the PDFs are slightly incorrect IMHO:

-----
<</MediaBox [ 0
0
751.18
1003.45996
]
/CropBox [ 0
0
751.18
1003.45996
]
-----

instead of

-----
  /MediaBox [ 0 0 595 842 ]
-----

So the size of the first example ist not recognised correctly using
convert although the JPG got the right size:
-----
$ convert -verbose 1.pdf 3.jpg
"gs" -q -dQUIET -dSAFER -dPARANOIDSAFE -dBATCH -dNOPAUSE -dNOPROMPT
-dMaxBitmap=500000000 -dEPSCrop -dAlignToPixels=0 -dGridFitTT=0
"-sDEVICE=pnmraw" -dTextAlphaBits=4 -dGraphicsAlphaBits=4 "-g612x792"
"-r72x72"  "-sOutputFile=/tmp/magick-XXFIKoXW" "-f/tmp/magick-XXMcQfxF"
"-f/tmp/magick-XXNBuXso"
/tmp/magick-XXFIKoXW PNM 612x792 612x792+0+0 DirectClass 8-bit 1.38681mb
1.pdf PDF 612x792 612x792+0+0 DirectClass 16-bit 1.38681mb
"gs" -q -dBATCH -dSAFER -dNOPAUSE -sDEVICE="jpeg"
-sOutputFile="/tmp/magick-XXVy4wS9" -f"/tmp/magick-XXFaxElN"
------
$ identify 3.jpg
3.jpg JPEG 751x1003 751x1003+0+0 DirectClass 8-bit 101.1kb
------

We have to resize the JPG an this breaks all up:

------
$ convert -verbose -scale 150x150 1.pdf 3.jpg
"gs" -q -dQUIET -dSAFER -dPARANOIDSAFE -dBATCH -dNOPAUSE -dNOPROMPT
-dMaxBitmap=500000000 -dEPSCrop -dAlignToPixels=0 -dGridFitTT=0
"-sDEVICE=pnmraw" -dTextAlphaBits=4 -dGraphicsAlphaBits=4 "-g612x792"
"-r72x72"  "-sOutputFile=/tmp/magick-XXFShoQL" "-f/tmp/magick-XXe7dHbe"
"-f/tmp/magick-XX9s62SG"
/tmp/magick-XXFShoQL PNM 612x792 612x792+0+0 DirectClass 8-bit 1.38681mb
1.pdf PDF 612x792 612x792+0+0 DirectClass 16-bit 1.38681mb
1.pdf=>3.jpg PDF 612x792=>116x150 116x150+0+0 DirectClass 16-bit 18.0059kb
$ identify 3.jpg
3.jpg JPEG 116x150 116x150+0+0 DirectClass 8-bit 18.0059kb
------

this leads to a file with the wrong trimming.

We're using Gentoo-Linux. An the problem appears with any
ImageMagick-Version we have installed.

ImageMagick 6.3.3 04/18/07 Q16 http://www.imagemagick.org
ImageMagick 6.3.0 02/01/07 Q16 http://www.imagemagick.org
and some 6.1.x.x

I already messed aroung with delegates.xml without luck.

Any help would be appreciated.

If you need one of the PDF files just let me know to provide a download
link.

Kind regards,

-- 
Rüdiger Kern
Systemadministration           Tel: +49-931-880755-90
fidion GmbH                    Friedrich-Bergius-Ring 15
http://www.fidion.de/          97076 Würzburg