How to Script copy+paste a grayscale layer into Channel with Scripting?

[aetherean]

Trying to automate channel packing for Unity 3D in photoshop wtih scripting .jsx, but I have no idea how to:

1. Take a non-visible grayscale layer and paste it directly into the Red channel.

2. Take another non-visible grayscale layer and do that same thing with the Green channel.

3. Take another non-visible grayscale layer and paste it into a new mask on the active (visible) layer.

I've figured out how to save out and other things just fine, I just can't figure out how to modify channel data (seems from the documentation it's readonly?).

Thanks!

[Stephen_A_Marsh]

The forum needs to understand the file and layer structure.

Is the source a separate file? Is the destination a separate file?

Or a single file?

How many files may be open at a singe time? Will you be working on other projects at the same time, or will only the required files be open for this task?

What colour mode are the source and destination docs? Grayscale or RGB? If the source layers are "grey" then can we presume that the RGB channels are exaxtly the same for the sourxe file (R=G=B)?

You don't mention the B channel.

Can you show cropped screenshots of the layers panel for the source and destination files, as well as the channels panel for both files? Can you provide sample files?

Will channels always have the same names? What about the layers? What about source and destination file names?

You know the files and workflow, others don't.

[c.pfaffenbichler]

Please explain the process more clearly, ideally post the images or at least meaningful screenshots including the pertinent Panels. 

An RGB image can obviously not contain a grayscale Layer so how many files are you talking about? 

How can the corresponfing files be identified – is there a naming convention? 

Edit: Should have refreshed the page before posting … 

[Stephen_A_Marsh]

Haha, great minds...