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This is Nautilus script offers a right-click option for Nautilus to compress PDF files. It uses ghostscript as backend and zenity for a pseudo GUI.
INSTALL:
To install it, copy the file 'Compress PDF' to your ~/.local/share/nautilus/scripts folder and make it executable (either "right click > properties > permissions" in nautilus or run in a terminal "chmod +x ~/.local/share/nautilus/scripts/Compress\ PDF").
GHOSTSCRIPT OPTIONS (TO ADAPT THE SCRIPT, UNDERSTAND IT OR OTHER):
gs -dPDFSETTINGS=/screen -dCompatibilityLevel=1.4 -dNOPAUSE -dQUIET -dBATCH -sDEVICE=pdfwrite -sOutputFile=output.pdf input.pdf
/screen (72dpi), /ebook (150dpi), /printer (300dpi), /prepress (300dpi, colorpreserving) - /default is 72dpi in GS doc but ~300dpi in ubuntu
some extra options:
-dCompatibilityLevel=1.4 (the higher the better; use 1.1 (unknown?; result differs), 1.2 for Acrobat3, 1.3 for Acrobat4 [default for screen] and 1.4 for Acrobat5 [default for the others])
-dSAFER (disable deletion and overwriting; recommended for scripts)
-dColorConversionStrategy=/LeaveColorUnchanged (/LeaveColorUnchanged is the default, but some PDFSETTINGS change it to /sRGB (/screen and /ebook; it has broken some images to me) or /UseDeviceIndependentColor (/printer) which I find it makes files larger)
fine-tune image quality options:
-dAutoFilterColorImages=false (automatically choose the following item or do not; default is true)
-dColorImageFilter=/FlateEncode (for lossless deflate, use /DCTEncode for JPEG; /LZWEncode currently does nothing, but may do LZW in the future)
-dDownsampleColorImages=true (allow downsampling; true for screen and ebook and false for the others)
-dColorImageResolution=$DPI
-dColorImageDownsampleType=/Bicubic (can also be /Average or /Subsample; current implementation treats /Bicubic as /Average)
-dAutoFilterGrayImages=false
-dGrayImageFilter=/FlateEncode
-dDownsampleGrayImages=true
-dGrayImageResolution=$DPI
-dGrayImageDownsampleType=/Bicubic
-dAutoFilterMonoImages=false
-dMonoImageFilter=/CCITTFaxEncode (Huffman, default for all)
-dDownsampleMonoImages=true
-dMonoImageResolution=$DPI (300dpi for screen and ebook, 1200dpi for the others)
-dMonoImageDownsampleType=/Bicubic
nearly useless options:
-sPAPERSIZE=[letter,a4]
-dDEVICEWIDTHPOINTS=w -dDEVICEHEIGHTPOINTS=h (point=1/72 of an inch)
-dFIXEDMEDIA (force paper size over the PostScript defined size)
-dFirstPage=pagenumber
-dLastPage=pagenumber
-dAutoRotatePages=[/PageByPage,/All,/None]
-sPDFPassword=password
-r72 (dpi resolution of the output device; does not seem to have any effect in our case)
-dOptimize=true (does not seem to work; use pdfopt)
-dEmbedAllFonts=true (seems to be the default)
-dSubsetFonts=true (seems to be the default; set it to 'false' to embed the whole fonts; works only if the previous is true)
-dMaxSubsetPct=100 (embed as subset if the % of glyphs used in the text is less than that; works only if the previous is true)
Read more @ http://web.mit.edu/ghostscript/www/Ps2pdf.htm#Options
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