function pdf-shrink --description 'Optimize PDF'
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dNOPAUSE -dQUIET -dBATCH \
-dConvertCMYKImagesToRGB \
-dGrayImageFilter=/DCTEncode -dColorImageFilter=/DCTEncode \
-dAutoFilterGrayImages=false -dAutoFilterColorImages=false \
-dDownsampleColorImages=true -dDownsampleGrayImages=true -dDownsampleMonoImages=true \
-dColorImageResolution=150 -dGrayImageResolution=150 -dMonoImageResolution=150 \
-dColorImageDownsampleThreshold=1.1 -dGrayImageDownsampleThreshold=1.1 -dMonoImageDownsampleThreshold=1.1 \
-dPreserveHalftoneInfo=false -dPreserveOverprintSettings=false \
-dTransferFunctionInfo=/Apply -dUCRandBGInfo=/Remove \
-sOutputFile=$argv[2] $argv[1]
end