crop command

[Vokey, John]

LiveCode graphics gurus:
  I have to process a few thousand photograph files through a simple set of manipulations that scales, translates and rotates the images to a common standard, and then crops them to a fixed size.  The code is simple, except apparently the crop command doesn't work on file-based image objects.  How do I manipulate the file-based image to allow for the crop command?
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