For what it's worth Neil, I have reproduced on OS X 10.7 exactly the behaviour that you are seeing. Namely the downloaded PDF has the customized thumbnail numbering scheme before editing (also a blurred page 96). As a test I swapped the order of pages 6 and 7 and as a result the customized thumbnail numbering disappeared and the PDF file size jumped from 4 MB to 610 MB.
This I would suspect is a bug in Preview. PDF's internally have a large number of alternative layout schemes -- it's a bit of a hodge-podge. I suspect that the original PDF used a layout scheme that caused Preview to, to use the technical term, freak out. When it saved its in-memory representation to disk, it made a file far larger than it needed to be. If this assumption is correct your only recourse for now is to use a different application to rearrange your PDF. Given the unusual nature of the bug, and how hard it is to trigger it I would guess you may not see a fix for Preview any time soon. Cheers, Carlo On 01/01/2012, at 17:18 , Mike Fuller wrote: > I'm running Mac OS 10.6.8. > > I was intrigued by your file sizes Neil so I tried saving a PDF book (52 pp) > from Preview. > > Original size - 5.1MB - quality good > Saved size - 4.9MB using no quartz filter - quality equally good > Saved size - 1.9MB using reduce file size in quartz filter - quality > relatively poor. > > Another scanned magazine (192 pp) > > Original size 83.3MB - quality good > Saved size - 83.3MB using no quartz filter - same quality > Saved size - 10.1MB using reduce file size - quality very poor > > So what was happening with your file sizes? (which I realise is what you were > asking originally). I haven't tried swapping pages between copies yet - maybe > later tonight and I'll let you know the results. I probably won't explore the > numbering dilemma at this stage. > > Curiouser and curiouser > > Mike Fuller > > > > On 01/01/2012, at 4:03 PM, Neil Houghton wrote: > >> A further update - even though the file size has doubled - applying this >> filter does significantly reduce the image quality. >> >> I may end up just keeping both copies of the book - it feels "wrong" but I >> do get all pages in maximum image quality for less than 9MB in total ;o( >> >> Cheers >> >> >> >> Neil >> -- >> Neil R. Houghton >> Albany, Western Australia >> Tel: +61 8 9841 6063 >> Email: n...@possumology.com >> >> >> on 1/1/12 2:05 PM, Neil Houghton at n...@possumology.com wrote: >> >>> Hi Carlo, >>> >>> That's a good tip, thanks - I DID know about this but didn't actually think >>> of it! - and I can't even blame the bubbles, they came later ;o) >>> >>> As a simpler test/comparison of this, I tried two things: >>> 1. I opened the 4.2MB file in Preview and then just did a "Save as" with no >>> file changes or filters applied: Resulting file size was 610.4 MB. >>> 2. I then did the same with the "Reduce file size" filter applied: Resulting >>> file size was 9.8MB - still well more than double the original file size - >>> but MUCH better than 610MB!! >>> >>> While it would be NICE to end up with the original 4.2 MB file size, I could >>> certainly live with the 9.8MB one. Now, if I could just solve the thumbnail >>> re-numbering issue... >>> >>> >>> Cheers >>> >>> >>> >>> Neil >> >> >> >> -- 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>
