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Support images with channels != 3 #42
_Imported from Trac. This issue originally by _agoode* at 2010-05-06T16:45:01Z.*
For fluorescence imagery, channels may not equal 3. If channels = 1, then we can use the existing read_region API to produce gray. Otherwise, some new API will need to be invented.
openslide_open may fail if channels != 1 or 3. We may need a new open function as well.