Print Booklet with White Lines Issue

Question

I have searched low and high on this forum and the internet for a solution, with no luck so far. I'm hoping that you InDesign gurus can help!
Whenever I use the 'Print Booklet' feature to generate a booklet from my InDesign CS5 brochure, the output has thin white lines in various areas that should NOT be there. The lines mostly show up in areas where I am using transparent PNG files, but there are no effects on the layers for these images.
This is an odd problem because:
In the original source while viewing it there are no lines
I can print to high resolution PDF using the standard print features and everything is 100% perfect, no lines
I can export each page as a high resolution JPG and everything is 100% perfect, no lines
The lines ONLY appear when I use the "Print Booklet" function. I have tried many things that have not worked:
Changing virtually every setting in Print Booklet to something else, lines are still there
Printing to a PDF directly from 'print booklet' with many different settings, lines still there
Printing to a PS file from 'print booklet', lines still there
Printing to an XPS file from 'print booklet', lines still there
I've put up an example showing you two different outputs. The one on the left is a regular JPG export, the one on the right is the Print Booklet export. Click on the images to see a larger example:
http://www.seenbest-web-design.com/techclub/?p=1282
I've seen other people post about this problem elsewhere going as far back as CS3, but have never found a cause or a way to fix this. Some people have said 'it's just a rendering issue in Adobe Reader, and the lines will not actually appear when you have it printed'. However, when I go to print from my PDF file to my printer the lines are there in the output. They are also there when I print to a XPS document and view the image on the screen.
Any ideas?

Answer 1

It's a transparency flattening artifact called Stitiching and basically, becasue youare printing to PDF you're up the creek. It only happens when transparency is flattened, but printing to PDF is a distiller function, and distiller doesn't support live transparency.
The best way around this, I think, would probably be to use an imposition script to impose a copy of the file, then export spreads from that using Acrobat 5 or higher compatibility, or, if you need to do this a lot, look into a PDF imposing plugin -- Quite Imposing gets good reviews here.
If you want to go withteh script, may favorite is Dave Saunders BuildBooklet javascript (http://pdsassoc.com/downloads/Buildbooklet.zip) but it has some limitations, no creep, 2-up saddle stitich only, and no objects crossing a spine. Slightly more sophisticated is his MakeBooklet script (Dave's CS3 Booklet Script) but it is still a lot less versatile than an impostion plugin.