Fred,
Thanks for the idea. I've finally solved it and it did relate to the number of pixels.
The first problem was that after import into Opus 04, the background of every picture was set to black.
This then left faint lines on zooming. These were removed by adding 1 to the pixel width of each image object that was affected. It didn't have to be an even number, however. Sometimes an odd number solved the problem.
I was actually doing a zoom transition on a frame, not the image object itself (contrary to what I first said!). Within the frame was the image object and a text object. Didn't investigate further, but I suspect that it is something to do with the ratio of frame size to image size?.
In any case you were on the right track - playing with the pixel width solved the problem. Thanks.
/Mark
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