How to Compress a Scanned PDF
A scan is a stack of photographs, so ordinary PDF compression barely helps. Downsampling to 150 DPI and greyscale typically cuts 80–95%.
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2 guides tagged “Scanning”.
A scan is a stack of photographs, so ordinary PDF compression barely helps. Downsampling to 150 DPI and greyscale typically cuts 80–95%.
Divide the file size by the page count and the cause becomes obvious — scanned images, print-resolution graphics or embedded fonts each need a different fix.