= RFC 14: NoData Bitmasks = 

Author: Frank Warmerdam[[BR]]
Contact: warmerdam@pobox.com[[BR]]
Status: Development

== Summary ==

Some file formats support a concept of a bitmask to identify pixels that are not valid data.  This can be particularly valuable with byte image formats where a nodata pixel value can not be used because all pixel values have a valid meaning.  This RFC tries to formalize a way of recognising and accessing such nodata bitmasks through the GDAL API.

==  

{{{
    virtual CPLErr BitmaskIO( GDALRWFlag, int, int, int, int,
                              GByte *, int, int, GDALDataType,
                              int, int *, int, int, int );
}}}


== Implementation Plan ==

This change will be implemented by Frank Warmerdam in trunk in time for the 1.5.0 release.

== SWIG Implications ==
 

== Testing ==