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Georeferencing creates multi channel tif - why?

Question asked by Gagag on Jul 20, 2018

I am georeferencing a geotiff that has only one band - or channel. However, after it is georefernced, ArcMap creates a geotiff that has 3 bands ,Red, Green abd Bluw and makes it an RGB image. This is not desirable. How to force ArcMap to keep the same number of bands as there are in the input geotiff? Thank you.

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