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looking for the right graphics transfer mode



I need to add track made from a round image with a transparent background onto a movie.  The only transfer mode I've found so far that respects the transparency of the original image is QDConnstants.addMax.  However, this blends the tracks which is not ideally what I want.  I want to overlay the tracks as in QDContants.srcCopy, but maintaining the transparency such that my overlay track appears round without a rectangular background of any kind.

I've tried several different methods including QDConstants.transparent with the color set to the background color.  This didn't work either.  I got either no transparency in the overlay or very patchy, pixelated transparency.  I know my colors are correct since I'm explicitly creating the source images and setting the colors accordingly.

Any thoughts?

Thanks,

Alex


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