Origin of Mask Array for Flat Field

[calvin.harman@…]

The flat field calculation must set a mask array, but the inputs to the flat
field function only take readouts, which don't have mask arrays. How do the
mask arrays enter the flat field function?

[eugene]

you are right: the input arguments should have an input image and an input mask.

In reviewing that further, we would also like to have the flat-fielding

performed in place, only returning a status:

bool pmFlatField (psReadout *in, psReadout *mask, const psReadout *flat);