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ArcGIS Pro 2.3.2 : can't classify a raster with alpha band

Question asked by on Jul 23, 2019

I have a raster with two bands : a RVB band and an alpha band.


I want classify it but ArcGIS Pro show Classify Option only if the raster have 1band... is it normal ?


I try the tool extract band and i extract only the band 1 (RVB)

but i lost the "no data" information and now i have a value every where on the extent raster and i don't want it.


Can you help me to flat the 2 bands in one band and then have the possibility to use the classify option ?


Thanks for your help