Problem converting transparent PDF to PNG

Hello all -

I'm having the problem (which Professor Google tells me is common) converting PDF to PNG. The PDFs are white text on a transparent background, and when I convert them I only get a solid white document. This is on Red Hat 4.x, and due to that limitation, Rackspace is only able to get GS 7.07 installed.

gs -q -dNOPAUSE -dBATCH -sDEVICE=pngalpha -r300 -dEPSCrop -sOutputFile=/path/to/output.png /path/to/input.pdf

I've tried all the variations on the above I can think of. Any suggestions?

- Brian
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	Problem converting transparent PDF to PNG by Brian Dunning :: Rate this Message: \| View Threaded \| Show Only this Message Hello all - I'm having the problem (which Professor Google tells me is common) converting PDF to PNG. The PDFs are white text on a transparent background, and when I convert them I only get a solid white document. This is on Red Hat 4.x, and due to that limitation, Rackspace is only able to get GS 7.07 installed. gs -q -dNOPAUSE -dBATCH -sDEVICE=pngalpha -r300 -dEPSCrop -sOutputFile=/path/to/output.png /path/to/input.pdf I've tried all the variations on the above I can think of. Any suggestions? - Brian _______________________________________________ gs-devel mailing list gs-devel@... http://ghostscript.com/cgi-bin/mailman/listinfo/gs-devel
	Re: Problem converting transparent PDF to PNG by Chris Liddell :: Rate this Message: \| View Threaded \| Show Only this Message On 17/06/11 15:07, Brian Dunning wrote: > Hello all - > > I'm having the problem (which Professor Google tells me is common) converting PDF to PNG. The PDFs are white text on a transparent background, and when I convert them I only get a solid white document. This is on Red Hat 4.x, and due to that limitation, Rackspace is only able to get GS 7.07 installed. > > gs -q -dNOPAUSE -dBATCH -sDEVICE=pngalpha -r300 -dEPSCrop -sOutputFile=/path/to/output.png /path/to/input.pdf > > I've tried all the variations on the above I can think of. Any suggestions? Do you mean that the PDFs use the PDF transparency capabilities for the background? Or that the background is just "not marked"? Chris _______________________________________________ gs-devel mailing list gs-devel@... http://ghostscript.com/cgi-bin/mailman/listinfo/gs-devel
	Re: Problem converting transparent PDF to PNG by Brian Dunning :: Rate this Message: \| View Threaded \| Show Only this Message Interesting question, I'm not sure. I start with a transparent, blank doc saved as a Photoshop PDF, and then I use FPDI/FPDF in PHP to add the white text. That's the doc. On Jun 17, 2011, at 7:25 AM, Chris Liddell wrote: > Do you mean that the PDFs use the PDF transparency capabilities for the > background? Or that the background is just "not marked"? _______________________________________________ gs-devel mailing list gs-devel@... http://ghostscript.com/cgi-bin/mailman/listinfo/gs-devel
	Re: Problem converting transparent PDF to PNG by john Culleton-3 :: Rate this Message: \| View Threaded \| Show Only this Message On Fri, 17 Jun 2011 07:07:26 -0700 Brian Dunning <brian@...> wrote: > Hello all - > > I'm having the problem (which Professor Google tells me is common) > converting PDF to PNG. The PDFs are white text on a transparent > background, and when I convert them I only get a solid white > document. This is on Red Hat 4.x, and due to that limitation, > Rackspace is only able to get GS 7.07 installed. > > gs -q -dNOPAUSE -dBATCH -sDEVICE=pngalpha -r300 -dEPSCrop > -sOutputFile=/path/to/output.png /path/to/input.pdf > > I've tried all the variations on the above I can think of. Any > suggestions? > > - Brian > _______________________________________________ > gs-devel mailing list > gs-devel@... > http://ghostscript.com/cgi-bin/mailman/listinfo/gs-devel > Not sure that PNG can handle transparency. John Culleton _______________________________________________ gs-devel mailing list gs-devel@... http://ghostscript.com/cgi-bin/mailman/listinfo/gs-devel
	Re: Problem converting transparent PDF to PNG by Brian Dunning :: Rate this Message: \| View Threaded \| Show Only this Message Thanks Ray. How would I do what you suggest? Can that be added to my command? I'm executing this from within PHP as an exec(). On Jun 17, 2011, at 8:43 AM, Ray Johnston wrote: Brian, Your pdf probably has transparency. The pngalpha device needs to be extended to add a 'put_image' proc that is able to handle the alpha plane from the pdf14 transparency compositor. The default pushes an image after flattening the alpha and blending with the background color, thus the white page. This could also be addressed if the default put_image wrote a ImageType 3 which has a mask plane as well as the page image so that the pngalpha device would not see the masked pixels written, but the put_image is MUCH more efficient. Regards, Ray Johnston On 6/17/2011 7:07 AM, Brian Dunning wrote: Hello all - I'm having the problem (which Professor Google tells me is common) converting PDF to PNG. The PDFs are white text on a transparent background, and when I convert them I only get a solid white document. This is on Red Hat 4.x, and due to that limitation, Rackspace is only able to get GS 7.07 installed. gs -q -dNOPAUSE -dBATCH -sDEVICE=pngalpha -r300 -dEPSCrop -sOutputFile=/path/to/output.png /path/to/input.pdf I've tried all the variations on the above I can think of. Any suggestions? - Brian _______________________________________________ gs-devel mailing list gs-devel@... http://ghostscript.com/cgi-bin/mailman/listinfo/gs-devel _______________________________________________ gs-devel mailing list gs-devel@... http://ghostscript.com/cgi-bin/mailman/listinfo/gs-devel
	Re: Problem converting transparent PDF to PNG by john Culleton-3 :: Rate this Message: \| View Threaded \| Show Only this Message Some parts of this message have been removed. Learn more about Nabble's security policy. On Friday, June 17, 2011 10:25:51 am Chris Liddell wrote: > On 17/06/11 15:07, Brian Dunning wrote: > > Hello all - > > > > I'm having the problem (which Professor Google tells me is common) > > converting PDF to PNG. The PDFs are white text on a transparent > > background, and when I convert them I only get a solid white document. > > This is on Red Hat 4.x, and due to that limitation, Rackspace is only > > able to get GS 7.07 installed. > > > > gs -q -dNOPAUSE -dBATCH -sDEVICE=pngalpha -r300 -dEPSCrop > > -sOutputFile=/path/to/output.png /path/to/input.pdf > > > > I've tried all the variations on the above I can think of. Any > > suggestions? > > Do you mean that the PDFs use the PDF transparency capabilities for the > background? Or that the background is just "not marked"? > > Chris > _______________________________________________ > gs-devel mailing list > gs-devel@... > http://ghostscript.com/cgi-bin/mailman/listinfo/gs-devel I am not sure that png supports transparency. -- John Culleton "Death Wore Black" Police procedural: http://www.deathworeblack.com/ "Create Book Covers with Scribus" http://booklocker.com/books/4055.html _______________________________________________ gs-devel mailing list gs-devel@... http://ghostscript.com/cgi-bin/mailman/listinfo/gs-devel
	Re: Problem converting transparent PDF to PNG by Bugzilla from martin@oneiros.de :: Rate this Message: \| View Threaded \| Show Only this Message 2011/6/28 John Culleton <john@...>: > I am not sure that png supports transparency. It does. https://secure.wikimedia.org/wikipedia/en/wiki/Portable_Network_Graphics#Transparency_of_image Best Martin PS: http://www.penmachine.com/techie/emailtrouble_2003-07.html _______________________________________________ gs-devel mailing list gs-devel@... http://ghostscript.com/cgi-bin/mailman/listinfo/gs-devel
	Re: Problem converting transparent PDF to PNG by jfplante :: Rate this Message: \| View Threaded \| Show Only this Message Brian, Did you get to solve the problem? I seem to run into the same problem... Jf Brian Dunning wrote: Thanks Ray. How would I do what you suggest? Can that be added to my command? I'm executing this from within PHP as an exec(). On Jun 17, 2011, at 8:43 AM, Ray Johnston wrote: > Brian, > > Your pdf probably has transparency. The pngalpha device needs to be extended to > add a 'put_image' proc that is able to handle the alpha plane from the pdf14 transparency > compositor. The default pushes an image after flattening the alpha and blending with > the background color, thus the white page. > > This could also be addressed if the default put_image wrote a ImageType 3 which has > a mask plane as well as the page image so that the pngalpha device would not see > the masked pixels written, but the put_image is MUCH more efficient. > > Regards, > Ray Johnston > > On 6/17/2011 7:07 AM, Brian Dunning wrote: >> >> Hello all - >> >> I'm having the problem (which Professor Google tells me is common) converting PDF to PNG. The PDFs are white text on a transparent background, and when I convert them I only get a solid white document. This is on Red Hat 4.x, and due to that limitation, Rackspace is only able to get GS 7.07 installed. >> >> gs -q -dNOPAUSE -dBATCH -sDEVICE=pngalpha -r300 -dEPSCrop -sOutputFile=/path/to/output.png /path/to/input.pdf >> >> I've tried all the variations on the above I can think of. Any suggestions? >> >> - Brian >> _______________________________________________ >> gs-devel mailing list >> gs-devel@ghostscript.com >> http://ghostscript.com/cgi-bin/mailman/listinfo/gs-devel >> > _______________________________________________ gs-devel mailing list gs-devel@ghostscript.com http://ghostscript.com/cgi-bin/mailman/listinfo/gs-devel

Problem converting transparent PDF to PNG

Problem converting transparent PDF to PNG

Re: Problem converting transparent PDF to PNG

Re: Problem converting transparent PDF to PNG

Re: Problem converting transparent PDF to PNG

Re: Problem converting transparent PDF to PNG

Re: Problem converting transparent PDF to PNG

Re: Problem converting transparent PDF to PNG

Re: Problem converting transparent PDF to PNG