You might want to take a look at "ImageCalc". This program was described
earlier this year in BioTechniques, vol 18 No.6, pp 1050-1055.
I have obtained a copy, but have not yet had a chance to put it through
it paces so I can't vouch for its usefullness.
-- FRG
***********************************
Frank R. Gorga, Ph.D.
Dept. of Chemistry & Biochemistry
Duquesne University
Pittsburgh, PA 15282
412-396-5858 / 412-396-5683 (fax)
gorga at next.duq.edu