> So I tried adding a black background to the image first, then rotating
it -- much better. <br>> See the enclosed version of your test code, and a
rotated image.<br><br>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. <br><br>Huge thanks.<br>
<br>And to anyone else coming down this road, if the resampling filters aren't having any effect, update to the latest PIL.<br><br><br><br><br><br><br><br>