[ATM] Fringe XP and flats

["Philip Lardner" <philiplardner@eircom.net>]

I?ve have been playing with FringeXP and OpenFringe to look at the igrams
for my flats. Both of these programs assume that you are testing against a
reference flat of known quality to deduce the surface errors in the plate
under test. In my case, I don?t have a reference flat as I am making my flat
by comparing three plates in pairs ? all of unknown quality! The best I can
do is to tell me the size and shape of the gap between the two plates under
test. Is there some way (is it even possible) to extract the surface shape
of each plate given three sets of igrams to work on (AonB, BonC & ConA)?

Phil.
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