Forget for the moment about being able to get Batch to open files from multiple folders or every other file or the like. Batch just ain't that smart... The JavaScript gurus would be able to script a solution, but that puts the "solution building" into the hands of someone else.

What will work (I just tried it) and is something you could do is the following. It's based on the ability to invoke an action with Batch against "pre-opened" files. (Note Bath Source option "Open Images") Although a bit clunky, it might work for you.

Suppose you have 2 open images named A and B and that B is the active image and last in the Window > Documents list.

Your action would go something like this in CS, CS2. (e-mail me if you have PS7 or CS3) * Canvas size: 100% wider (or taller) as needed
* Select previous document (A)
* Select > all
* Edit > copy
* File > close (no save)
* Edit > paste (new layer)
* Select > all
* Layer > align to selection > [whatever option so pasted layer is in the right place] * Layer > Flatten
* File > Save as... (.jpg, specify any folder at this point, do NOT change the file name), specify .jpg options, OK
* File > Close [no save]

STOP recording

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To test the batch process, open an even number of test images. 4-6 would be fine.

File > Automate > Batch
* Action [the one just recorded]
* Source: Open Images
* Destination: Folder (browse to \destination of your choice)

(X) Override action 'save as' commands [trust me on this]

Click OK and away you should go.

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Options for "pre-opening" files:
* Photoshop File > Open
* -or- Drag/drop from Explorer window into PS window
* -or- Create an action with [literally] no steps. Invoke it in Batch (Source: Folder, Destination: None). Result: Files from \source opened into PS window. Works great.

How many files at a time? Depends on how much RAM you have. You'll need to experiment.

You'll need to come up with a system to keep track of files finished and those yet to do.

"What if I have an odd # of images for a run?" You could duplicate any of the open images and optionally "fill it with white."

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Hope this gets you moving.

sandysmall

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Combining 2 images into one using batch and action