On Wed, 22 Feb 2017 14:38:33 -0700, the...@sys-concept.com wrote: > I have scaned pdf file (88-page) 23MB in size (downloaded this way). > Trying to reduce the size of the file I use some on-line web-page and it > did a good job. PFD file went from 23MB to 13MB looking at both files > there is not difference in quality. > > I was trying to duplicate the result via linux command linux command > line using "convert" "gs" etc, I can not even come close.
I haven't used it for a while, but qpdf has tools for examining, extracting and compressing data in PDFs. Comparing elements of the two PDFs should gives you a good idea of what was done. That level of compression was most likely achieved by using more lossy compression on images. -- Neil Bothwick User-friendly: (adj.) trivialized, slow, incapable, and boring.
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