How do you Display a Scaled Photo in a Dialog?

I'll admit I'm new to scripting in Lua/Lightroom and apologize if this is a trivial question.
I'm attempting to write a plug-in to assist in a workflow for scanned images.
The idea is to scan in the images and then use the plug-in to help process them
efficiently by selecting options that I'll write specific code for.
The plug-in will access a set of images selected from the Libraby module.
In order for the plug-in to work effectively I need to display a preview/thumbnail
of the image currently being processed in the plug-in's dialog box. I have successfully
used viewFactory:picture to display the image, but it displays the image at full resolution
which is way to big.
Is there a way to use viewFactory:picture and scale the image down to a reasonable size?
Is there a way to access the lower resolution preview images that already exist in Lightroom?
Is there a way to do this that I am missing?
I'm currently using Lightroom 2.5. The dialog I'm attempting to design would look a lot like
the one provided in the Library module in Metadata -> Edit Capture Time, with my own
workflow logic options.
Many thanks to anyone who can point me in the right direction.

Hi John,
I took a look at an lrprev file - looks like standard jpeg image(s) in some kind of non-standard envelope. If you rename it .jpg or .tif then ACDSee will open it and display the thumbnail.
I didn't look at the database files that go with it, but they might reveal something if one had a look.
Anyway, LrViewer certainly proves the previews are accessible if one troubles to figure out how.
The original poster could even try setting one of the lrprev files as a resource (maybe with a better suffix, like jpg or tif) and see if view-factory:picture would displays the thumbnail. One would still need to figure out how to get the right one though - that's where taking a peek at the database might come in handy.
That's all I got,
Rob

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How do you Display a Scaled Photo in a Dialog?

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