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Image differencing with fuzzy overlay?

Question asked by potte137 on Mar 17, 2016
Latest reply on Mar 20, 2016 by progis99

I have 80 Landsat images, and I have calculated 5 vegetative indices for each one and then created a fuzzy overlay of the indices.  So I have 80 images that are fuzzy overlays.  My question is, would it be practical to do image differencing using these fuzzy overlays?  For instance, a NDVI value of 0.7 means the same thing in all image dates, but does a fuzzy overlay value of 0.7 mean the same thing between images?  Or is it being scaled in each image according to the rest of the values?