Selectable layer mixing algorithms

[mkarg]

Describe the new feature:
OpenShort currently seems to have just a single algorithm to mix layers into final frames (alpha blending).

Several other picture and video editing software supports different mixer algorithms, and lets the user choose it per layer. The benefit of that is that you can produce creative effects, like using a black-white still image on a top layer as a "stencil" on bottom layer, or dynamically change bottom track's colors driven by the top track etc.

Describe the solution you'd like:
Allow the user to select the mixer algorithm per layer. Besides the current algorithm (alpha blending), there could be e. g. "Luminance" (which produces pixels having luminance from top layer but color from bottom layer).

Describe alternatives you have considered:

• Using third party VideoFX software.
• Let effects read pixels from more than one layer to be able to mix pixels from at least two layers.

[ferdnyc]

Agreed, it would be nice to have.

I'm going to close this as there's already an issue open for libopenshot, and this would have to be implemented there first. (Some UI to select modes would also be needed in OpenShot, but library support is a prerequisite.) The request can be tracked there.

Duplicate of OpenShot/libopenshot#320

[mkarg]

Agreed, it would be nice to have.

I'm going to close this as there's already an issue open for libopenshot, and this would have to be implemented there first. (Some UI to select modes would also be needed in OpenShot, but library support is a prerequisite.) The request can be tracked there.

Duplicate of OpenShot/libopenshot#320

Oops, sorry for creating the duplicate. :-)

[ferdnyc]

@mkarg No worries, it's not even in the same repo. You could hardly have known!