Quote:
Originally Posted by HarryT
Any advice would be gratefully received!
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I have noticed that highly compressed PDFs I've looked at over the years tend to (1) use 1-bit color layers and/or (2) use JPEG-2000 / JPX compression streams. For instance, if I scan a black and white document that I've marked with a red pen on the copiers where I work, at high compression settings, the copier scanning algorithm creates two layers: a black/white 1-bit layer for the black and white text plus a separate red/transparent 1-bit layer to overlay my red markups. It seems like a pretty sophisticated algorithm. I'm sure if you enhance your contrast ratio via some of the suggestions already made, you should be able to compress to fewer shades of gray--maybe even 1 bit (just black and white), but I'm not sure you quite have the resolution for that.