Re: Change JPG images to fit into an A4 PDF page

On Wed, 25 Nov 2009 21:51:29 +0100
Sebastian Krause <[email protected]> wrote:

| Anthony Thyssen <[email protected]> wrote:
| > I have added this to the notes in IM examples, File Formats, PDF
| >   http://www.imagemagick.org/Usage/formats/#pdf_alturnatives
| >
| > Question can that perl script 'fix' a PDF that IM generated, or is it
| > restricted to PDF's created by sam2p??
| 
| Unfortunately it doesn't work with default PDFs created by IM, you
| get the following error:
| 
| $ sam2p_pdf_scale.pl 595 842 test.pdf
| sam2p PDF syntax error (no cm)
| 
| Now I'm not really familiar with the internal file structure of PDF,
| but the beginning of a 640x400 PNG converted by sam2p looks like
| this:
| 
| ,----
| | %PDF-1.2
| | %Çì<8f>¢
| | 2 0 obj
| | <</Type/Pages/Kids[4 0 R]/Count 1>>
| | endobj
| | 3 0 obj
| | <</Length 1565>>
| | stream
| | q
| | 640 0 0 400 0 0 cm
| | BI/Interpolate false/W 640/H 400/CS/DeviceGray /BPC 8/F/Fl ID
| | [...]
| `----
| 
| The second to last line is what the script is looking for:
| 
| ,----[ sam2p_pdf_scale.pl ]
| | die "sam2p PDF syntax error (no cm)\n" if $S!~m@\n((\d+) 0 0 (\d+) 0 0 cm\b)@g;
| `----
| 
| Now if we could somehow tell IM to store the units this way, the
| script might work on those PDFs as well.
| 

Or have IM incorporate the -page option (or a specific 'coder' -define)
so users don't have so much trouble with PDF (and PS) pages of images.


  Anthony Thyssen ( System Programmer )    <[email protected]>
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   "All I can say is, enthusaim, sincerity, genine compassion, humour, can
   carry you through any lack of experence with... higher numerical values!"
          -- Ivoniva's Theory of Relationships,   Babalon 5, "Sic Transit Vir"
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     Anthony's Castle     http://hobbit.ict.griffith.edu.au/~anthony/

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