[CS3 / VBS] jpeg export - light horzontal line in final image...

Hello,
I am having an issue when exporting jpegs.
When I output at the same dpi as an image placed on my document, I am getting between 1 and 5 horizontal light-colored lines showing up on the created jpeg. If I increase or decrease the output resolution by around 10 dpi, the line goes away.
For example, my document has a 300 dpi image on it, I export at 300 dpi, I get a light colored line horizontal through just the image on the page, not anything to the left or right of the image area. If I output a 310 dpi jpeg, everything looks fine.
This behavior happens whether called in code or exported by hand through the InDesign interface. I have also tried exporting to pdf, and it is find - no light-colored line. Last bit of information: The images I am using are both 24 bit color tiffs and grayscale tiffs. I have not tried it yet with other file formats.
Anybody else run into this - and if so, what can I do about it?
Thanks!

I think I may have found out the problem here.
The problem areas are with the high contrast blue and red-and other areas but blue and red show the most degradation. Obviously, DV being 4:1:1 (Panasonic DVCPro, NOT the 4:2:0 of DV PAL) there is a lot of colour information missing and the blue channel always takes the heaviest losses on the DVCPro format.
The reason we've never seen this before is because we've always used the HVX cameras for either DVCPro 50 or DVCPro HD in this particular setup. In normal DV mode we almost always use our DVX100's which do have the different colour sampling and manage to smooth over this high contrast blue and red issue because of the sampling method and other factors like lesser quality optics, CCD blocks etc.
So, by colour smoothing the material, something which QT player appears to do by default (I'm awaiting a reply from my engineer friend at Apple to confirm this) the steppy vertical lines disappear and everything is back to normal. It doesn't matter if the material is stretched out way beyond it's original dimensions, with the colour smoothed it fixes the banding on the high contrast red and blue areas.
So the conclusion is format/codec, using a blue screen when a green one is far better suited to DV and subject material all conspired to produce the problem.
As for the 1024 x 576 quandry, you say it doesn't exist yet if you select the Widescreen PAL square pixel preset in AE, the frame dimensions are...naturally: 1024 x 576. We also produce all our graphics for our video's at SD at that resolution and they work a treat in FCP in the anamorphic projects.

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