Is there a way to select matching pixels on 2 different layers?

Hey there,
I've been wondering about this a long time now and can't seem to figure it out. I hope u guys can help me crack this.
If I shoot 2 different portraits (of 2 different people), against the same background (a complex one not a backdrop), using a locked frame on a tripod, giving me the same exact background in both pictures, with only the portraits changing.
If I then take these 2 pictures, and create layers out of them in the same Photoshop document, and align them perfectly on top of each other.
Is there a way (action, plugin, script, etc...) to select the pixels that did not change between the 2 layers? In other words, the pixels that create the background of both pictures?
And would it make it easier if I shoot the background alone, and then the portraits, and then follow the same steps?
I'm posting this, and crossing my fingers.
Thanks,
Pierre.

Changing the blend mode of the upper layer to Difference, will show identical pixels as full black. To make a selection, you'd need to produce a copy merged layer (Shift Ctrl Alt e) and you could select the full black pixels by simple a method as using the magic wand with a low tolerance value. In fact a tolerance of '1' will select all the identical pixels, but tiny variations in lighting etc. may need a higher tolerance.
Save the selection, turn off the copy merged layer, change the blend mode of the upper layer back to normal > And you are good to go.
I am wondering how you intend using this though, and what sort of end result you are hoping for? Give it a try and come back to us if it doesn't work out

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Is there a way to have InDesign parse some sort of markup-elements in plain text? I could tweak the MySQL output with PHP to wrap all strange symbols in a markup-item like [japanese]blabla[/japanese]. If that would be converted to characterstyle "Japanese" on import, I would be helped a lot as well.
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toGray.matchAttributesAny = -1;
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Is there a way to select every other page in a pdf and convert it to grayscale?

I'm going to ask this question in a few sub-forums, so if you think you've seen it, you might have. Someone suggested it might be done with Javascript. I know nothing about Javascript.
Where I work I use a program that can print to pdf. We use it to produce mailings, usually postcards, that are addressed.
I often end up with a 500 page document that will print on 250 sheets of cover stock, which will get cut into 1,000 postcard, all pre-addressed and sorted by zip code.
Usually, the address side is all black and the front is color. The printers we use can print a black click on the address side and a color click on the other, IF the pdf is set up that way. Otherwise, both sides will be counted as color clicks.
I know I can select pages individually in a pdf and convert them to grayscale and those pages will be counted by the printer as black clicks, which are cheaper than color clicks.
The problem is, I have not figured out how to convert all the odd numbered pages to grayscale at once. As a result, I usually end up printing the color side simplex, then putting the job back in the tray and printing the black side. Of course, that only works if only one side is personalized, sometimes both sides are.
Is there a way to select every other page in a pdf and convert it to grayscale?

The Acrobat SDK has sample code that shows how to convert the colors for one page (the first page of a document). This sample can easily be adjusted to process every other page. You can then use an Action that executes this JavaScript to process the document. Do you know how to create an Action? If so, you can use this script (as I said, adapted from the sample in the SDK) to convert all odd pages (1, 3, 5, ...):
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toGray.matchSpaceTypeAny = ~toGray.constants.spaceFlags.AlternateSpace;
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toGray.convertIntent = toGray.constants.renderingIntents.Document;
toGray.embed = true;
toGray.preserveBlack = false;
toGray.useBlackPointCompensation = true;
toGray.action = toGray.constants.actions.Convert;
// Convert every other page
for (var i=0; i<this.numPages; i++) {
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if (i % 2 == 0) { // change to "if (i % 2 != 0) {" for all even numbers
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