I have ECW file and am using version arcmap 10.2.2.The file has been cut in some areas covered with a white background.When I want to set a certain Rastr under current Lrastr I could not see what was placed under cover in the wake of the white cover.Is it possible to be neutralized if I create the catalog Rastr white areas to exclude and I will get Snhtcn file from areas that were covered in white paint.Here is an example of a file that I have now.
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