Image processing histograms

[Lesley-Ann Dupigny]

I am trying to develop a strategy for examining cloud top radiances and
temperatures in GRASS4.0. I would like to be able to generate a hard copy
of the histogram of the count values (similar to that from d.histogram),
so that I could select different threshold levels. So far I have only been
able to eyeball the values from d.profile and d.histogram, but would
appreciate if you could suggest a more quantitative module by which to be
able to categorize the data.

Looking forward to your reply.

Lesley-Ann Dupigny.