Hi Clive, The effectiveness of compression of a PDF will vary wildly depending on the content. Large PDF files normally contain a large number of images or a few very large images. If you have access to the source of the PDF you can choose to compress the images at a lower resolution and thus cut down on the size dramatically. You can also purchase tools which will compress the images in a PDF even if you do not have the original source document.
Regards, Carlo On 26/06/2012, at 14:05 , Clive Slater wrote: > Hi Carl > > A .pdf > > Clive > On 26/06/2012, at 2:00 PM, cm wrote: > >> Hi Clive, >> >> Compression works principally by finding patterns of repeated bits >> and replacing them with an copy of the pattern and a count of how >> many times the pattern is repeated. So a file with a lot of spaces >> in it, or an mp4 video with large areas of the screen all the same >> colour will compress down very nicely. However, if the file you are >> trying to compress contains little repetition such as an executable >> program file, then you will get very little compression. >> >> What was the file you were trying to compress? >> >> Regards, >> Carlo >> >> On 26/06/2012, at 13:55 , Clive Slater wrote: >> >>> Hi >>> >>> OSX 10.4.11 g4, >>> >>> Trying to compress a 37mb file using archive does not compress the >>> file , turns it into a .zip but the file size is the same size. What >>> am I missing. >>> >>> Regards >>> >>> Clive >>> -- The WA Macintosh User Group Mailing List -- >>> Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> >>> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> >>> Settings & Unsubscribe - <http://lists.wamug.org.au/listinfo/ >>> wamug.org.au-wamug> >> >> -- The WA Macintosh User Group Mailing List -- >> Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> >> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> >> Settings & Unsubscribe - <http://lists.wamug.org.au/listinfo/ >> wamug.org.au-wamug> > > -- The WA Macintosh User Group Mailing List -- > Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> > Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> > Settings & Unsubscribe - > <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug> -- The WA Macintosh User Group Mailing List -- Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> Settings & Unsubscribe - <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>
