raster layer properties and mask patches

[Bernhard Herzog]

Jonathan Coles <jonathan at jpcoles.com> writes:

> o The mask color and whether or not the mask should be used
>   are saved in the .thuban file.

Do we have to use a color for the mask?  Giving special meaning to
inband values (i.e. values that are not per se special) always feels
like a crutch to me.  A real bitmap for a mask would be better IMO.

   Bernhard

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