[Image-SIG] Histogram

[Manik Bali]

Hi ...
I have a tiff image file of 16353 rows and 40320 which are uniformly
gridded.
I want to count the pixels of each type in a gaussian rectangle  with
pixels which lie on the border be counted as the fraction that is inside
the Gaussian grid.
Is there a builtin function to do this in pil. Is the histogram overloaded
to count fraction of grid bos inside a given rectangle and so on....
Please  help
Rgds
Manik