> So I tried adding a black background to the image first, then rotating it -- much better. > See the enclosed version of your test code, and a rotated image.
Wow, what a difference! Even if the border is a single pixel, much better results. I set the border color to grey, which seems to work as well as black, and am now a happy slideshow maker. Huge thanks. And to anyone else coming down this road, if the resampling filters aren't having any effect, update to the latest PIL.
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