Make the background transparent?

Greetings. Newbie here :slight_smile:

Using blender-2.41, I’m creating an animation, which is coming along nicely, but I’d like to have the background transparent. At the moment, it’s blue.

How do I make it transparent?

I’m not sure if you can render out an animation to a codec with the BG transparent.

You can render out the anim to TGA or PNG images with the BG transparent, and then composite it all back into the sequence editor with what ever BG you want. Turn on either TGA or PNG as the output file type and then turn on the RGBA button and finally, turn on the PREMUL button.

Now if anyone knows how to render an anim with transparent BG, I’m sure they will tell you.