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Quality when converting
Posted: 2012-09-04T09:26:27-07:00
by Flo
Hi
I wrote a script that divides each page of a pdf into two, so that you can print twice as large with the same paper size.
But the quality of file at the end is too low, and I do not know why and how to fix it.
Can you help me please?
Here is the script :
Code: Select all
#!/bin/sh
for var in "$@"; do
pdfcrop "$var" "$var-crop" # Suppression des marges
pdftoppm "$var-crop" temp # Convertir la PDF en images
for f in temp-*.ppm; do # Découpe des images et conversion pdf
convert "$f" -crop 1x2+00+20@ -scale 100% +repage +adjoin "$(basename $f .ppm)-1x2@_%d.pdf";
done
convert "temp-*@*.pdf" "$(basename "$var" .pdf)-agrandi.pdf" # Assemblage des fichiers PDF agrandis
rm -r temp* "$var-crop" # Suppression des fichiers temporaires
done
Flo
Re: Quality when converting
Posted: 2012-09-04T09:30:32-07:00
by Bonzo
I would guess that you need to add -density 400 or similar although this will probably mean you need to recalculate your crops etc.
Code: Select all
convert -density 400 "$f" -crop 1x2+00+20@ -scale 100% +repage +adjoin "$(basename $f .ppm)-1x2@_%d.pdf";
Re: Quality when converting
Posted: 2012-09-04T10:29:49-07:00
by Flo
I tried with this option, but the result is the same.
In fact, the lack of quality not seen the pdf file, but only on paper after printing, maybe the problem is not with imagemagick.
Flo
Re: Quality when converting
Posted: 2012-09-04T11:36:55-07:00
by fmw42
You may need to add -density again after reading the input so that it is specified for the output pdf
Re: Quality when converting
Posted: 2012-09-04T12:11:35-07:00
by Flo
This is what I tried :
Code: Select all
#!/bin/sh
for var in "$@"; do
pdfcrop "$var" "$var-crop" # Suppression des marges
pdftoppm "$var-crop" temp # Convertir la PDF en images
for f in temp-*.ppm; do # Découpe des images et conversion pdf
#convert "$f" -crop 1x2+00+20@ -scale 100% +repage +adjoin "$(basename $f .ppm)-1x2@_%d.pdf";
convert -density 400 "$f" -crop 1x2+00+20@ -scale 100% +repage +adjoin "$(basename $f .ppm)-1x2@_%d.pdf";
done
convert -density 400 "temp-*@*.pdf" "$(basename "$var" .pdf)-agrandi.pdf" # Assemblage des fichiers PDF agrandis
rm -r temp* "$var-crop" # Suppression des fichiers temporaires
done
Re: Quality when converting
Posted: 2012-09-04T12:50:43-07:00
by fmw42
Can you post a link to an example pdf and the exact command to process it rather than the script. That is fill in the parameters with values and file names. That way we can test ourselves to see what may the issue.