ExtendScript CS5 - Bridge - Exporting JPEGs as 300DPI from PSDs

Question

I know that Bridge has an Export menu that can be used to convert PSDs to JPEG and then convert them, but I can't figure out how to get access to these functions through the ExtendScript API.
I basically have an array of Thumbnail objects that I need to iterate through and export out 300 DPI JPEGs as I go.
Any ideas? I've already read through the manuals and didn't find anything of use.
My current relevant line looks like:
bm.exportTo(new File(exportFilePath),100);

Answer 1

You best drop this question in the dedicated Bridge scripting forum:
http://forums.adobe.com/community/bridge/bridge_scripting
Personally I would PS itself for this and create an action for this and the 300 ppi miracle figure is just what is, a figure, no more no less.
Many confuse it with dpi (dots per inch) but this is about the density of the ink dots used for printing. Ppi (pixels per inch) is the common term for digital images (that are made out of pixels, not ink dots… )
As long as you don't alter the amount of pixels you can use whatever figure you want without changing the total amount of the pixels, it just means the width and height are extended or increased because of the total amount of pixels used per inch. Anyone can alter this again without consequence for the image quality of the original file, as long as you don't start recalculating pixels to enlarge the or decrease the file size.
That said, In CS6 you have the option to create an action for both landscape and portrait using image / image size and fill in 300 pixels per inch and be sure to have the resample option unchecked. Also record a save action and without touching the original filename (if you do it records this also and overwrite each file with the new one) and choose a folder.
Create a new action and use 'insert conditional' (fly out menu top right of action panel) and choose the landscape action to play for landscape file, else: portrait.
Select the files in Bridge, use menu tools / PS / batch and select your action, hit OK and you are done.
You can also create a droplet but sadly enough you can't see them in Bridge and drop files on, but you can drag them to the desktop to let the action play.
Plenty of options I would think