Quote - And I still don't get the point. We can use nodes to fill the "Background" with anything we want, but if you save with transparency, you pretty much have completely discarded it, right? Why bother programming a background if you're going to ignore it in post?

Correct me if I'm wrong, but doesn't background affect the edge pixels in a tranparent png? I've gotten different results in the past when I've rendered over the default gray, vs. over black, vs. over a background image or background color. Yes, the pixels are partially transparent, but wouldn't the matte color that affects that transparency change based on your settings? Especially with items that have a high transparency or translucence.

I need to do some tests to try it out, but when you affect the background, even if you're exporting with transparency, I would assume you'd get different results. And then when you composite later (for example, if you need to composite many elements into one image that would be a pain to render all together), you don't get some halo effect or an unrealistic transparency. Is that incorrect?