Compress PDF files with ghostscript. GitHub Gist: instantly share code, notes, and snippets. I was trying to reduce the size of pdfs whilst ensuring that they met a certain dpi or ppi for my thesis. Reducing size of pdf with ghostscript. ?id= Bug ID: Summary: Downsampling not supporting different filters for monochrome.

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In this case their order is determined by when they are found in the input file.

Change image compression in PDF files with ghostscript

From here, you can type the full path or […]. KenS 22k 1 21 Reporting a bug, as I suggested in an early comment would probably have got to this point much sooner. However, in some cases it actually increases the file size.

These allow Ghostscript to preserve as much as possible the drawing elements of the input file maintaining flexibility, resolution independence, and editability. We recommend ghostscriot to the ijs device for all such printing.

I tried all the other command line things, but in the end, this allowed me to ghostsscript the compression enough for my purposes. These numbers start with 0 for the first spot color. This can be overriden by the command line option -r DPI.


A PostScript program could ghostscrupt these fownsample and print only ghostdcript selected page range. The printer resolution cannot be selected directly using PostScript commands from Ghostscript: The size of the subsampling box n should be 4 for optimum output, but smaller values can be used for faster rendering. If anyone has a definitive answer, please let us know. Generally Ghostscript will support a maximum of 64 process and spot colors.

Email Required, but never shown. Centimeters and millimeters ISO standard paper sizes such as A4 and A3 are commonly represented in the SI units of centimeters and millimeters. If Ghostscript was not compiled with this device as the default output device, you have to specify it on the command line.

These options control the use of subsample antialiasing.

I decided to post this solution of mine after watching a C tackling of the problem. I have created such an algorithm, taking advantage of recursive computing provided by the Hoopsnake plugin.

ghostscript downsampling of pdf images, downsample factor error – Stack Overflow

I’m looking for a way in Ubuntu to reduce the size of a pdf by reducing the quality of the images. We’re very much interested in taking patches from people who have ported it to non-mainstream platforms.


This code was borrowed from Kurt Pfeife. Usually, this should match the Ghostscript resolution set with the -r switch. Please see the Use documentation for a complete description.

Open the Windows printer with the merged orientation and size. Ghostacript tiffscaledtiffscaled4tiffscaled8tiffscaled24 and tiffscaled32 TIFF drivers also provide the following two parameters: The lookup table data follows.

It is not currently recommended for the faint of heart. Their use is still experimental and they could be removed in a future version. Can one do it using convert?

Details of Ghostscript Output Devices

All driver authors are encouraged to adapt their drivers for IJS, and if there is an IJS driver available for your printer, it should be your first choice. I just used an input file of myPic. This is the default. Attempting to do so will generate an error.

I think the gs I have is from OS X.