PostScript - How can I trim the margin when converting from PS/PDF to PNG?

Author

How can I trim the margin when converting from PS/PDF to PNG?

Tassilo Horn

2007-08-25, 10:12 pm

Hi,

I use GPL GhostScript 8.60 to convert PostScript or PDF files to a set
of PNG files using the command:

gs -dNOPAUSE -sDEVICE=png16m -dTextAlphaBits=4 -dBATCH \
-dGraphicsAlphaBits=4 -dQUIET -r100 -sOutputFile=page-%d.png \
foo.pdf

Now I'd like that the margins of the PS/PDF files are cut off, so that
the resulting PNGs don't have a border at all. Is that possible with
ghostscript somehow?

ImageMagick's convert tool can do that with its -trim option, but
convert is awfully slow compared to gs.

Thanks for any pointers,
Tassilo

Govert J. Knopper

2007-08-26, 4:27 am

> I use GPL GhostScript 8.60 to convert PostScript or PDF files to a set
> of PNG files using the command:
>
> gs -dNOPAUSE -sDEVICE=png16m -dTextAlphaBits=4 -dBATCH \
> -dGraphicsAlphaBits=4 -dQUIET -r100 -sOutputFile=page-%d.png \
> foo.pdf
>
> Now I'd like that the margins of the PS/PDF files are cut off, so that
> the resulting PNGs don't have a border at all. Is that possible with
> ghostscript somehow?
>
> ImageMagick's convert tool can do that with its -trim option, but
> convert is awfully slow compared to gs.

This is for EPS files: http://dsanta.users.ch/resources/soft/epsbboxfit.pl

I do something similar for PDF files in a Windows .net application, using
GhostScript to find the bounding box of the imaged area and iTextSharp to
create a new PDF with the content of the original file and the size of that
bounding box. Next step for you would be to convert the cropped PDF to PNG.

Govert

http://www.noliturbare.com

Tassilo Horn

2007-08-27, 8:08 pm

"Govert J. Knopper" <check_my_site_4_contact> writes:

Hi Govert,

> This is for EPS files:
> http://dsanta.users.ch/resources/soft/epsbboxfit.pl
>
> I do something similar for PDF files in a Windows .net application,
> using GhostScript to find the bounding box of the imaged area and
> iTextSharp to create a new PDF with the content of the original file
> and the size of that bounding box. Next step for you would be to
> convert the cropped PDF to PNG.

Thanks a lot. I'll have a look at it.

Bye,
Tassilo
--
How many roundhouse kicks does it take to get to the center of a tootsie
pop? Just one. From Chuck Norris.

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