[gdal-dev] Storing mask as part of the *.ovr file

[Even Rouault]

> But if I do:
> 
>     gdal_translate rgbmask.vrt rgb_with_external_msk.vrt -mask none -b 1 -b
> 2 -b 3 -of VRT

I guess in the above you meant without "-mask none", so 

"gdal_translate rgbmask.vrt rgb_with_external_msk.vrt -b 1 -b 2 -b 3 -of VRT"

Well, that's a consequence of the behaviour of the 'auto' mode of -mask in
https://gdal.org/programs/gdal_translate.html#cmdoption-gdal-translate-mask
This is admitedly not super intuitive as the example I gave before lacked the "-mask none" 
when generating  rgb_with_external_msk.vrt

As you copy all non-mask input band, and mask is in auto mode, and thus copied too, this is 
equivalent to

gdal_translate rgbmask.vrt rgb_with_external_msk.vrt -of VRT

and the VRT driver is then smart enough to detect that its source is a VRT, so it is an 
equivalent of a single "cp" of the original VRT.



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