Created
June 23, 2024 21:43
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A latexmkrc file to compress PDFs with non-JPEG images on Overleaf after compilation
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| #!/usr/bin/perl | |
| ## Put this (Perl) file in the root of your Overleaf project. It overrides the | |
| ## `pdflatex` compilation command to run GhostScript as a post-process which will | |
| ## compress non-JPEG images to JPEG in the output PDF file. The JPEG quality | |
| ## settings are set to high to minimize the loss of image quality. This should | |
| ## work well even for images that contain a lot of high-frequency noise. | |
| ## To disable, simply rename the file to something other than latexmkrc. | |
| ## | |
| ## Created by Iliyan Georgiev. | |
| ## Quality settings | |
| $PDF_VERSION = 1.4; | |
| $IMG_DOWNSAMPLE = 'true'; | |
| $IMG_DOWNSAMPLE_DPI = 600; | |
| $IMG_DOWNSAMPLE_THRESHOLD = 1.0; | |
| $IMG_COMPRESSION_QFACTOR = 0.15; # lower is better (try 0.08 for higher quality) | |
| $PASSTHROUGH_JPEGS = 'true'; | |
| ## Don't modify these, they are specified by Overleaf | |
| $GS_INPUT_FILE = '%B.pdf'; | |
| $GS_OUTPUT_FILE = '%B-embed.pdf'; | |
| ## You can try setting below: -dNEWPDF=true | |
| ## This fails in the current GhostScript v9.55 on Overleaf | |
| $GS_COMMAND = "gs | |
| -sDEVICE=pdfwrite | |
| -sOutputFile=$GS_OUTPUT_FILE | |
| -dCompatibilityLevel=$PDF_VERSION | |
| -dPDFSETTINGS=/default | |
| -dFastWebView=true | |
| -dEmbedAllFonts=true | |
| -dSubsetFonts=true | |
| -dCompressFonts=true | |
| -dDetectDuplicateImages=true | |
| -dDoThumbnails=false | |
| -dAutoRotatePages=/None | |
| -dDownsampleColorImages=$IMG_DOWNSAMPLE | |
| -dColorImageDownsampleType=/Bicubic | |
| -dColorImageDownsampleThreshold=$IMG_DOWNSAMPLE_THRESHOLD | |
| -dColorImageResolution=$IMG_DOWNSAMPLE_DPI | |
| -dDownsampleGrayImages=$IMG_DOWNSAMPLE | |
| -dGrayImageDownsampleType=/Bicubic | |
| -dGrayImageDownsampleThreshold=$IMG_DOWNSAMPLE_THRESHOLD | |
| -dGrayImageResolution=$IMG_DOWNSAMPLE_DPI | |
| -dDownsampleMonoImages=$IMG_DOWNSAMPLE | |
| -dMonoImageDownsampleType=/Subsample | |
| -dMonoImageDownsampleThreshold=$IMG_DOWNSAMPLE_THRESHOLD | |
| -dMonoImageResolution=$IMG_DOWNSAMPLE_DPI | |
| -dConvertCMYKImagesToRGB=true | |
| -dColorImageFilter=/DCTEncode | |
| -dGrayImageFilter=/DCTEncode | |
| -dMonoImageFilter=/CCITTFaxEncode | |
| -dColorConversionStrategy=/LeaveColorUnchanged | |
| -dPassThroughJPEGImages=$PASSTHROUGH_JPEGS | |
| -dProcessColorModel=/DeviceRGB | |
| -dRenderIntent=1 | |
| -dDefaultRenderingIntent=/Perceptual | |
| -dUseArtBox | |
| -dNEWPDF=false | |
| -dNOPAUSE | |
| -dBATCH | |
| -c \"<< /ColorACSImageDict << /VSamples [ 1 1 1 1 ] /HSamples [ 1 1 1 1 ] /QFactor $IMG_COMPRESSION_QFACTOR /Blend 1 /ColorTransform 1 >> >> setdistillerparams\" | |
| -f $GS_INPUT_FILE"; | |
| ## Remove new-line characters from GhostScript command | |
| $GS_COMMAND =~ s/\n//g; | |
| ## Set the pdflatex command to be used by Overleaf | |
| $pdflatex = "pdflatex %O %S; $GS_COMMAND; mv %B-embed.pdf %B.pdf"; | |
| ## For debugging | |
| # print "$GS_COMMAND\n"; | |
| # print "$pdflatex\n"; |
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