transparency in animation

[anon125]

i want to make an animation where the background is clear- transparent.
can this be done?
eventually it will be a gif animation
thanks

[RobCozzens]

Yes and no.
You can render a series of images with a transparent background by choosing RGBA in the format tab and an image format that supports transparency (like png).
But I don’t think you can save to a video codec (avi / mov / mp4) with transparency directly from Blender.

[anon125]

@RobCozzens

Yes and no.
You can render a series of images with a transparent background by choosing RGBA in the format tab and an image format that supports transparency (like png).
But I don’t think you can save to a video codec (avi / mov / mp4) with transparency directly from Blender.

thanks
a series of pics is just fine.
but it does put a white line around the shape.
i tried pemul in render but this time the white line did not vanish.
neither did sky work to lose the white line.(desperate stab!)

Attachments

[RobCozzens]

If this is going to be an animated gif, you could use “key” instead of sky or premul. The edges won’t be anti-aliased, but gifs don’t support that anyway.
Or you could render it bigger than you need with no anti-aliasing (OSA) and then scale it down later.
Or you can try changing the background color in blender to a similar color to the background color you’ll be playing this on.

[anon125]

@RobCozzens

If this is going to be an animated gif, you could use “key” instead of sky or premul. The edges won’t be anti-aliased, but gifs don’t support that anyway.
Or you could render it bigger than you need with no anti-aliasing (OSA) and then scale it down later.
Or you can try changing the background color in blender to a similar color to the background color you’ll be playing this on.

sadly with key the white line is clearly there

UPDATE: as suggested i turned off OSA - now i have an animated gif with no white line.
thanks