Jack,
Assuming that you export your slides in a lossless format, (tif, targa) they should look okay, but you could try going uncompressed, but then you’ll have to render and you won’t be able to play it in real time on your monitor. So this would be the last thing you do before going out to QT or Compressor.
Myself, I’d take the stills and blow them up to say, double in PhotozoomPro.
Have a wonderful day.