How to export 3-band raster geotif and make background transparent

Susan HedenbergSusan Hedenberg NewbiePosts: 5
edited January 2015 in Raster Data
Hi, I'm a nuub and need to export raster geotifs in 8-bit, 3-band format but keep the background transparent. When I try using the 'make background pixels transparent' in the export menu, it adds the 4-th band. My client can't use the 4th band. Is there another way to do this?

Susan
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