Project: datamanagement
Issue DM-3105: Add assertXNearlyEqual methods for image-like classes
Presently one can compare two image-like objects using free functions imagesDiffer, masksDiffer and maskedImagesDiffer in lsst.afw.image.testUtils. These should be replaced by assertXNearlyEqual methods that afw adds to lsst.utils.tests, as per DM-2193. If necessary, we could leave the old functions around for awhile. But I would prefer to simply get rid of them if we can. One subtlety is that the current functions take numpy arrays, not afw image-like class instances. Examine the existing users of the code to determine how best to deal with that.
Story points: 4