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

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.

Sebastian

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