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A few years ago I wrote a similar script. It exports a pdf-file from InDesign, then opens (rasterizes) it in Photoshop, resizes it and finally saves it as a new pdf-file (Photoshop version). It's much more complex than what you need but you can use it as a basis for your script.
Thanks Kasyan. Wow, you're right, that script really is complex. It's good to know my goal isn't impossible, and this definitely gives me a good foundation to start putting together my own script. Unfortunately it just doesn't seem like there's a lot of documentation out there on how to script with bridge talk.
BridgeTalk feature is documented in JS Tools Guide (see “Interapplication Communication with Scripts” chapter). But it’s quite confusing and contains many mistakes (typos). At least that was the case when I studied it in time of CS3.
IMHO the best way to learn BT is getting a working example script and figuring out, line after line, how it works. You can get many BT examples in Adobe Bridge SDK. Every line is commented and explained. I learned on these scripts.
You can also search for “Bridge Talk” in this forum and find many interesting posts. Here are a couple of links from my site that may come in handy to you: BridgeTalk, How to pass all parameters in a custom object via BridgeTalk.