Hello gdal devs!

I’ve got an 8-bit 3-band (RGB) GeoTiff file created in ArcGIS and it has a mask 
file (myfile.tif.msk) along with it, indicating which pixels have "nodata" 
value. When viewing it in ArcMap, I get “nodata” for masked pixels. But when 
viewing in QGIS, I get an unmasked raster and masked pixels return pixel values 
of R G and B bands. Gdalinfo doesn’t return a .tif.msk file in a list of 
dataset files (however it does return .aux.xml).

My goal is to add an internal mask band to GeoTiff files, so everything is 
packed within one file, and create a VRT mosaic afterwards. Another option is 
to use .tif.msk file as is. But I can’t find any options to gdal_translate, or 
gdalinfo to force gdal use the mask file. There isn’t much gdal documentation 
regarding .msk files. How can I read mask file with gdal and convert my initial 
RGB GeoTiff to a GeoTiff with a mask band from it?

Cheers,
Nick
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