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blender 2.91, I have a problem with Composite viewer node - I'm trying to preview contents using Image Editor however despite having all checkbox set Image Editor does not shows full output, particularly excludes alpha channel.

Any idea what's happening?

As you can see in the picture below I have "Use Alpha" set everywhere, Image Editor is in RGBA mode, yet there's alpha output lacking in the image editor. I tried to disconnect/connect nodes in the compositor, to force refresh, but no result

enter image description here

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  • $\begingroup$ Is it intended that the Red channel goes into the Alpha input of the Combine RGBA node? Otherwise, an image of the Alpha channel would be interesting, too. $\endgroup$ Dec 15, 2020 at 11:48

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The alpha channel has not been associated with the image.

To associate the alpha channel use an Alpha Convert node and set it to Straight to Premultiplied.

enter image description here

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