Use expression to control a Channel effect “Source layer mode”

[Al Parusto]

Hello there,

Is there an expression to control the source layer mode dropdown (“Source”, “Masks”, “Effects and Masks”) of a “Calculations” or “Set Channels” effects ?

– Al

 

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[Dan Ebberts]

No way to do that, I’m afraid. If you can’t keyframe it, you can’t control it with an expression.

[Al Parusto]

Thanks for your answer.

What’s weird is that I do have access to the first dropdown of this “Second Layer” property using :

effect.property("Second Layer").setValue(layerIndex);

But I can’t find a way to access to the second dropdown of that same property!

[Dan Ebberts]

Hmm… that looks like scripting. I thought you were asking about expressions.

[Constantin Maier]

If you’re talking about scripting, the only way to go about it is to add the effect to a layer, set the layer control to another layer, select “Effects & Masks” from the dropdown, then remove the referenced layer and now save the effect as a preset. Afterwards, you can apply the preset within your script and “Effects & Masks” will be selected right away.