Generating files of bounding boxes, etc?

[Rich Morin]

Let's assume that I have used gs to render some PDF into raster files
(one per page) of some known size.  I would like to be able to generate
corresponding files that contain the bounding boxes for each character
that was imaged, as:

  'F', 46, 100, 100, 120, 110
  'o', 6f, ...
  'o', 6f, ...

Although I'm pretty sure I can find a way to hack this into the code,
I thought I'd ask whether there's already something of this sort that
I should investigate.

-r
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