I have one scene, that I tried render a sequence the options (Don´t save alpha channel and output alpha channel to separate file are OFF)
The TIF images are render without alpha but I tried change “Image Format” to PNG and render without nothing in my scene, and my images render with alpha.
What I can do to render my scene in TIF with ALPHA?
Recent nigthly builds show this in the release notes :
Output TIFF files do not contain alpha channel - resolved.
So it seems you need to install the latest version.
But there is no Windows build available since almost a week (for the nightlies that are not “stable”), maybe the one from last monday already contained the fix, not sure.