Convert a pdf to an image format with imagemagick

Hi to all!!!

I'm trying to convert a pdf file into an image, for example JPG or PNG
format, with ImageMagick. I use the command line. For example: convert
header.pdf header.jpg. But I obtain a bad result. The jpg's quality is
very low. Why? I tried to use - quality 100 option but there isn't
improvement. I think also that this option isn't active for the pdf
conversion to an image format or not? I need some good ideas :D...

Thanks to all

fem

<femtox77@gmail.com> wrote in message
news:1185204380.330805.101900@r34g2000hsd.googlegr oups.com...
> Hi to all!!!
>
> I'm trying to convert a pdf file into an image, for example JPG or PNG
> format, with ImageMagick.

You could also use the online version at
http://redux.imagemagick.org/MagickS...gickStudio.cgi.

> I use the command line. For example: convert
> header.pdf header.jpg. But I obtain a bad result. The jpg's quality is
> very low. Why? I tried to use - quality 100 option but there isn't
> improvement. I think also that this option isn't active for the pdf
> conversion to an image format or not? I need some good ideas :D...

ImageMagick cannot improve the quality of an image embedded in a PDF.

When the PDF was created, the resolution of the embedded image was
established by Acrobat (if Acrobat was used to create it), probably via a
default setting in Distiller that causes the image to be downsampled to an
appropriate setting for web/screen viewing, i.e., 72 dpi for Acrobat
(Distiller) 3.

--
Bill Segraves

On 23.07.2007 17:26 femtox77@gmail.com wrote:
> Hi to all!!!
>
> I'm trying to convert a pdf file into an image, for example JPG or PNG
> format, with ImageMagick. I use the command line. For example: convert
> header.pdf header.jpg. But I obtain a bad result. The jpg's quality is
> very low. Why? I tried to use - quality 100 option but there isn't
> improvement. I think also that this option isn't active for the pdf
> conversion to an image format or not? I need some good ideas :D...
>
> Thanks to all
>
> fem
>

hi there

ImageMagick doesn't actually convert pdfs, all it does is to invoke
Ghostscript. You might want to call GS directly to gain more control
over it. Example of a GS command:

gs -q -sDEVICE=jpeg -dBATCH -dNOPAUSE -dFirstPage=1 -dLastPage=1
-r<OUTPUT RESOLUTION> -sOutputFile=<OUTPUT>.jpg <INPUT>.pdf 2>&1

this rasterizes first page of <INPUT>.pdf into <OUTPUT>.jpg with
resolution 300.



--
gosha bine

makrell ~ http://www.tagarga.com/blok/makrell
php made right ;) http://code.google.com/p/pihipi

On 24 Lug, 09:54, gosha bine <stereof...@gmail.com> wrote:
> On 23.07.2007 17:26 femto...@gmail.com wrote:
>
> > Hi to all!!!
>
> > I'm trying to convert a pdf file into an image, for example JPG or PNG
> > format, with ImageMagick. I use the command line. For example: convert
> > header.pdf header.jpg. But I obtain a bad result. The jpg's quality is
> > very low. Why? I tried to use - quality 100 option but there isn't
> > improvement. I think also that this option isn't active for the pdf
> > conversion to an image format or not? I need some good ideas :D...
>
> > Thanks to all
>
> > fem
>
> hi there
>
> ImageMagick doesn't actually convert pdfs, all it does is to invoke
> Ghostscript. You might want to call GS directly to gain more control
> over it. Example of a GS command:
>
> gs -q -sDEVICE=jpeg -dBATCH -dNOPAUSE -dFirstPage=1 -dLastPage=1
> -r<OUTPUT RESOLUTION> -sOutputFile=<OUTPUT>.jpg <INPUT>.pdf 2>&1
>
> this rasterizes first page of <INPUT>.pdf into <OUTPUT>.jpg with
> resolution 300.
>
> --
> gosha bine
>
> makrell ~http://www.tagarga.com/blok/makrell
> php made right ;)http://code.google.com/p/pihipi

Really thanks, now I try this method...

Femtox