the...@sys-concept.com <the...@sys-concept.com> [17-02-23 02:57]: > On 02/22/2017 03:12 PM, k...@aspodata.se wrote: > > Thelma: > >> I have scaned pdf file (88-page) 23MB in size (downloaded this way). > >> Trying to reduce the size of the file I [...] > > > > Why don't you extract the images with pdfimages from the pdf and > > compress them with xv or convert (imagemagic) and maybe gimp can > > comress them also. Don't know how to get them back into a pdf though. > > > > Regards, > > /Karl Hammar > > > > ----------------------------------------------------------------------- > > Aspö Data > > Lilla Aspö 148 > > S-742 94 Östhammar > > Sweden > > +46 173 140 57 > > I'm puzzled as to what program they used to compress the PDF file with such a > good quality output (PDF format as well). > > This is the link I use to compress the file: > https://online2pdf.com/pdf-reduce-size > > I've tried: > gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dDownsampleColorImages=true > -dColorImageResolution=150 -dNOPAUSE -dBATCH -sOutputFile=5.pdf > COVERAGE_July-1-2016.pdf > > gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE > -dQUIET -dBATCH -sOutputFile=5.pdf COVERAGE_July-1-2016.pdf > > convert -density 200x200 -quality 60 -compress jpeg COVERAGE_July-1-2016.pdf > 5.pdf > > gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE > -dQUIET -dBATCH -sOutputFile=5.pdf COVERAGE_July-1-2016.pdf > > The last one above gave me decent size I think about 5MB but the quality > wasn't very good. > All others, size was hardly reduced or quality was terrible. > > Gimp will open only one page at at time, so it is not suitable for this > conversion. > > -- > Thelma > >
Hi Thelma, may be it would gave you a hint, what happens to the PDF while compressing, so it is easier to duplicate the result. I think, the pdf which was the direct result of the scanning process is a series of images in a kind of pdf container. May be you will find a site on the internet (I dont know of any program on Gentoo, which does this) which is able to analyse the structure of a pdf. May the result of that analyses will give you a hint, what magic the compression process has done. By the way: What did you scann? Pure Text? Images only? A mixture of both? Line drawings? Did you find traces of an ocr process like mispelled word and/or missing character? HTH! Cheers Meino
