iBooks on iPad not showing images in PDFs

i'm seeing the same problem with my ipad. sync'd pdf book files downloaded from safari, they work fine on my macbook. most of the books show illustrations & images, but one book in particular shows some but not all. downloaded it from safari a second time, but problem remains.

Same problem here.
Added PDFs to iPad by send file via email and using "Open in iBook" option. Original document is PPT converted to PDFs. Everything looks fine on the computer but SOME images/charts do not show up in iBook? Also tried GoodReader with same problem. 😟 I'm also getting these random white horizontal lines over solid blocks of color?? Any help would be appreciated! THX

I have the same problem. After a bit of investigations I noticed that it has to do with the way the iPad is handling transparent layers. In practice if you have Acrobat Pro, you might save again the file making it compatible with Acrobat 4 (I didn't try with Acrobat 5, but I think it should work as well).

It's quite an annoyance. I think apple should give it a fix.

UPDATE: Since my post earlier this week, I've done some testing... When I optimize the file (in Acrobat Pro... Advance Tab -> PDF Optimizer...) it appears to fix the problem. jpegs, transparencies, and charts/graphs (only tested PDF created from PPT source file) all show up on the iPad (using iBooks).

Since I didn't need any additional functionality, I checked all the boxes in the "Discard Objects" menu (in the PDF Optimizer).

Can you please email me an affected (pre-optimization) PDF file?

Thanks,
Roy
<royb@apple.com>

Hi Roy,

I just sent you a file (sample.pdf). On the iPad I cannot see any images.
On a Mac instead everything is fine, both with Preview and Adobe Acrobat.

Cheers
Luca

Hi there, long time view, virgin contributor!

Anyway, my status aside, I can confirm that optimizing and saving in a version compatible with Acrobat 4+ seemed to do the trick! PDFs on my iPad are now rendered correctly! Thanks for the tip!

More update... PDF optimizer alone did not solve problem. On further testing, I find that larger files (15MB+) is less stable. Most of the images would show up but not all... FYI, my documents are mostly text intensive and some graphic charts/diagrams. Last test was With over 1500 pages. Looking at the space audit, more than 50% is for the content stream. On smaller files, everything seem to work ok???

fwiw, same problem with a couple of PDFs (not all)

I'm encountered the same problem as well. iBooks app isn't displaying images in any of the PDF ebooks I've purchased from Apress. On the other hand, PDFs purchased from O'Reilly Safari are displaying images just fine.

I noticed this as well on both ibooks and goodreader.
GoodReader's website has a great explanation of this.
It has to do with images in the PDF that are saved in the JPEG2000 format. Apparently the iPad doesn't display that.

Mac Users can fix this for free by opening the pdf in Preview, then doing a Save As.
I tried this and it worked fine for me.

Thanks BasementJack, it's a very good tip.

Nevertheless, the drawback of the Preview method, is that if your pdf has a lot of images, the size of the resulting file saved by Preview can be fairly big (up to 3 times the original file for scanned pdfs).

I prefer to save the document with Acrobat removing the jpeg2000 as explained in the GoodReader help section. http://www.goodiware.com/gr-man-trouble.html#pdfblankpages

Thats a good tip but unfortunately my pdf went from about 12meg to over 150...and I was emailing it to myself! I expect a cure from head office soon..

The problem is in image formats in PDF not PDF size!
In order to solve the problem you should open your file with Preview app (MAC) then save the file with Quartz filter named "Create Generic PDFX-3 Document"! Then replace the new file on iPad using iTunes.