I have a similar problem...
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To improve bitmap quality in Flash:
Thank you for your advice!!
But I am loading the picture in actionscript, based on url's in an XML file. So none of the pictures is imported in my library... Do you know if the settings you mentioned are applicable in actionscript as well?
I found one setting that gives already great results. The Bitmap objects have a property smoothing that can be set to true. The result is amazing, the quality improves a lot.
So this is, at the moment, my way to load the picture on screen. Maybe you have other advices?
bitmap_picture = new BitmapData ( loader_thumb.contentLoaderInfo.width,loader_thumb.contentLoaderInfo.height);
picture = new Bitmap (bitmap_picture);
picture.smoothing = true;