Banding problem when exporting to PDF

Hi.
I'm having a problem with a banding I'm getting everytime I export to PDF. The banding, of course, is in a gradient. In ID the image looks fine, but once exported to PDF I get that banding. I can do the same files in Photoshop and illustrator and get no banding. I saw some other posts and people were talking about the printer, but in this case the problem happens even before it hits the printer or RIP. The problem is with the export. Any suggestions on settings that I can use to solve this?
Thank you for your help.

On this forum, move your mouse over my photo by my posting and you will see my e-mail address. I can take e-mail attachments up to 25MB. Or you can post on an FTP server. Or you can use the service at http://sendnow.acrobat.com/ to upload files for me. (A basic account is free.) - or you can use any similar service for this purpose.
I would preferably like to see the minimal amount of your files that exhibit the problem so that implies the InDesign file with the gradient background and at least one photo with the drop shadow effect you are using. Your files will be kept confidential and deleted once we can determine what is going on (assuming we can).
The reason you cannot set any transparency flattener options for PDF 1.4 or greater is because those versions of PDF support live transparency. You absolutely want that! The moment you go for PDF versions less than 1.4, you are dealing with the problem of premature flattening which requires exact knowledge of the device resolution.
The other thing that is important to understand is that just because a particular gradient is specifiable doesn't mean that any or all or even some devices will render it well. We are dealing with conceptual specification versus physical device characteristics. The idea behind PDF 1.3 / PostScript Language Level 3 smooth shading-based gradients is that the actual rendition of the gradient to a raster is delayed until rendering time at which point, the particular RIP/device is supposed to optimize the rendered gradient for the particular device. Some RIP/printer vendors do a great job of this, others don't, and as indicated above, not all specified gradients look good when ink hits the substrate (or pixels hit the screen). Our experience is that gradients are often more art than science and we just need to experiement until we find the parameters that work to create the desired effect.
I am not trying to prejudge your situation. I believe you are seeing results that are not satisfactory. The question is what is causing them and how to finesse same. Looking forward to seeing your file (although I probably cannot get to them until at least Friday due to travel).
- Dov

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