It is interesting that the original JPEG files are actually bigger than the PDF. They must be using some type of compression. Perhaps Preview uncompressed the images and on saving failed to compress them again.
Just idle speculation at this point. :-) C On 01/01/2012, at 17:49 , Neil Houghton wrote: > Hi Mike, > > Yes, I'm not sure what is happening. It isn't the page swapping because the > test I did before replying to Carlo was just opening the file in Preview and > then re-saving - without any page swapping. > > The original pdf creation was obviously very good - you can actually look at > the original scanned jp2 files and they are around 70MB worth - before > cropping etc - the cropped and straightened JP2s are 30MB worth and they > have compiled them into a 4.2MB pdf - with very good image quality. > > However the 610.4 MB file that Preview produces does seem excessive!!! > > > Cheers > > > Neil > -- > Neil R. Houghton > Albany, Western Australia > Tel: +61 8 9841 6063 > Email: n...@possumology.com > > > > on 1/1/12 5:18 PM, Mike Fuller at blis...@tpg.com.au 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>
