Parent Topic: <A href="http://www.pcigeomatics.com/cgi-bin/pcihlp/GCPWORKS|Hints+and+Tips">Hints and Tips</a><hr>
<H4>Correcting Bitmaps</H4>
GCPWorks is capable of geometrically correcting bitmap (1 bit deep) images;
however, some special considerations apply.
<P>
<UL>
<LI> In order to select bitmap layers on a PCIDSK database, it is necessary that
the database have no image channels.  
</UL>
<UL>
<LI> If the uncorrected image is a bitmap image, and Image To Image tiedown is
performed it is required that the georeferenced image also be a bitmap.
</UL>
<UL>
<LI> Only the nearest neighbour resampling algorithm will work for bitmap
corrections.  The user is permitted to select other resampling methods;
however, the user selection will be ignored.
</UL>
<UL>
<LI> When creating a new output file to correct into it is necessary to create
one with only bitmap layers.  It is impossible to use GCPWorks to create a
PCIDSK file with a bitmap segment; however, one could be created with 
ImageWorks.
</UL>
<UL>
<LI> Support for georeferencing has been added to the GDB TIFF support via
an auxiliary file, so that a bitmap product produced as a TIFF B file can
retain it's georeferencing.
</UL>
<hr>
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