You can use one commandline with two commands (gs, convert) connected through a pipe, if the first command can write its output to stdout, and if the second one can read its input from stdin. Luckily, gs can write to stdout (… -o %stdout …). Luckily, convert can read from stdin (convert -background transparent – … Read more
sdaau, the command you used for trying to convert your PDF to CMYK was not correct. Try this one instead: gs \ -o test-cmyk.pdf \ -sDEVICE=pdfwrite \ -sProcessColorModel=DeviceCMYK \ -sColorConversionStrategy=CMYK \ -sColorConversionStrategyForImages=CMYK \ test.pdf Update If color conversion does not work as desired and if you see a message like “Unable to convert color space … Read more
This may not be the answer you are looking for (since you want to get your problems solved programmatically, not by an external tool). But you can use Ghostscript commandline to embed missing fonts in retrospect to PDFs which have not embedded them: gs \ -sFONTPATH=/path/to/fonts:/another/dir/with/more/fonts \ -o output-pdf-with-embedded-fonts.pdf \ -sDEVICE=pdfwrite \ -dPDFSETTINGS=/prepress \ input-pdf-where-some-fonts-are-not-embedded.pdf … Read more
Here’s an example of how you can downsample all (color, gray and mono) images to 72dpi with a Ghostscript commandline: gs \ -o downsampled.pdf \ -sDEVICE=pdfwrite \ -dDownsampleColorImages=true \ -dDownsampleGrayImages=true \ -dDownsampleMonoImages=true \ -dColorImageResolution=72 \ -dGrayImageResolution=72 \ -dMonoImageResolution=72 \ -dColorImageDownsampleThreshold=1.0 \ -dGrayImageDownsampleThreshold=1.0 \ -dMonoImageDownsampleThreshold=1.0 \ input.pdf Update: The *ImageDownsampleThreshold=1.0 parameters enforce that all Images with … Read more
https://gitlab.mister-muffin.de/josch/img2pdf As mentioned by PleaseStand, GhostScript (edit: prior to v9.23) will decode the JPEG data, resulting in generation loss, as well as performance “ten to hundred” times worse than img2pdf. Edit: Ghostscript 9.23 (2018-03-21) added a “JPEG Passthrough” capability that resolves the generation-loss/performance issue. ImageMagick (i.e. convert) also decodes and re-encodes the images.
If you are on a multicore system, make it use multiple CPU cores with: -dNumRenderingThreads=<number of cpus> Let it use up to 30mb of RAM: -c “30000000 setvmthreshold” Try disabling the garbage collector: -dNOGC Fore more details, see Improving Performance section from Ghoscript docs.
I was receiving the same error message. I then installed gs and the same command worked properly after that.
I’ve written my own script that does something similar to what you’re asking for. The script uses 4 tools to achieve its goal: ImageMagick’s compare command the pdftk utility (if you have multipage PDFs) Ghostscript (optional) md5sum (optional) It should be quite easy to port this to a .bat batch file for DOS/Windows. But first, … Read more
You’re missing the quantity of digits. Use: convert x.pdf x-%04d.jpg Where 4 means 4 digits will be show on the page count.
I found this script wriiten by Mr Weimer super useful: #!/bin/sh # # pdfsplit [input.pdf] [first_page] [last_page] [output.pdf] # # Example: pdfsplit big_file.pdf 10 20 pages_ten_to_twenty.pdf # # written by: Westley Weimer, Wed Mar 19 17:58:09 EDT 2008 # # The trick: ghostscript (gs) will do PDF splitting for you, it’s just not # obvious … Read more