: Re: How can I compress this pdf file without losing readability? I have a large black and white pdf scan of a book. The book is 1700 pages, and is about 300MB. That is about 150-175kb per page.

@Barbara

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Try searching for compressing PDFs in general. I personally use these:
pdftk in.pdf output out.pdf compress
Or:
pdf-compress-gray () {
local input=""
local out="${2:-${input:r}_cg.pdf}"
local dpi="${pdf_compress_gray_dpi:-150}"
gs -q -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -sProcessColorModel=DeviceGray -sColorConversionStrategy=Gray -dOverrideICC -dDownsampleColorImages=true -dDownsampleGrayImages=true -dPDFSETTINGS=/screen -dColorImageDownsampleType=/Bicubic -dColorImageResolution=$dpi -dGrayImageDownsampleType=/Bicubic -dGrayImageResolution=$dpi -dMonoImageDownsampleType=/Bicubic -dMonoImageResolution=$dpi -sOutputFile="$out" "$input"
}

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