Has anyone out there already written or come across a GIMP plug-in or script
that is designed to do adaptive thresholding of an image?

I have a large number of extremely large scanned grayscale images that need
to be converted to black and white.  Problem is that the contrast and
especially brightness of these images vary, not only between different
images, but also over different areas of a single image.  It is NOT adequate
to choose a single threshold value that will work across all of these
images, or even across the entire portion of a single image.

I've tried using the Adaptive Contrast plug-in as a preprocessor step to
thresholding, but that plug-in doesn't seem to be giving me the appropriate
level of contrast boost and brightness shift that would be needed.

Any help would be greatly appreciated.


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