How to merge channels from extendScript?

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i'm trying write script, using extendscript/javascript requires red, green , blue channels, available 3 separate grayscale images, merged rgb images.  of course can done photoshop channels menu, things users if done javascript.  suggestions?  mechanism writing 1 channel in javascript help  -- can 3 channels , i'm there.

 

the real problem have projector misaligned rgb components, not problem, give colored artefacts on black , white images.  i'm trying create image red , blue components moved in opposite direction project better.

have in adobe scripting guide , adobe scripting languages references?

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