I'am creating a simple fireball sprite for my game and I want to render a fire animation.

I would like to get the upper images with transparent background, but when is set the transparency on under Render -> Film one of my frames will look like lower pictures.

You can see the difference of these two images.

Thank you!

I'm creating a simple fireball sprite for my game and I want to render a fire animation.

I would like to get the upper images with transparent background, but when is set the transparency on under Render -> Film one of my frames will look like lower pictures.

You can see the difference of these two images.