View Single Post
Old 08-09-2016, 09:01 AM   #9
willus
Fuzzball, the purple cat
willus ought to be getting tired of karma fortunes by now.willus ought to be getting tired of karma fortunes by now.willus ought to be getting tired of karma fortunes by now.willus ought to be getting tired of karma fortunes by now.willus ought to be getting tired of karma fortunes by now.willus ought to be getting tired of karma fortunes by now.willus ought to be getting tired of karma fortunes by now.willus ought to be getting tired of karma fortunes by now.willus ought to be getting tired of karma fortunes by now.willus ought to be getting tired of karma fortunes by now.willus ought to be getting tired of karma fortunes by now.
 
willus's Avatar
 
Posts: 1,303
Karma: 11087488
Join Date: Jun 2011
Location: California
Device: iPad
Quote:
Originally Posted by HarryT View Post
Any advice would be gratefully received!
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.
willus is offline   Reply With Quote