Why I get alpha artifacts with blending modes?

[Luis D]

It happens with both  straight and premultiplied alphas...

[Kim 1318]

Could you please share a screenshot here so I can have a better idea of what Alpha Artifacts you are referring to? Also provide me the steps you are taking and exactly what you are trying to accomplish. 

You might also want to contact NCH Tech Support for assistance here: https://www.nch.com.au/support/index.html

[Luis D]

Hi,

It happens with simple compositing. Just change the blend mode and got alpha channel artifacts. It haappens with masks too and all layers got affected by this problem, not just the layer with different transfer mode. Tested in 5.11 and 5.14 builds.

Here a screenshot:

https://drive.google.com/file/d/1BbbJ2JEryz86h4pR5SeNox4byvzW-ZOU/view?usp=sharing

 

And the test file with the images:

https://drive.google.com/file/d/14uVVmFOFORE6Dk0fWwfQmhEzfZ64oXKi/view?usp=sharing

[Kim 1318]

You might also want to contact NCH Tech Support for assistance here: https://www.nch.com.au/support/index.html