The tool engine has a smart mechanism built in to recognize the best match for an input raster or image to convert it either to a classified grid (.grc) or to a numeric grid (.grd).
Using 'GTP for Vertical Mapper' you can create a .grc directly from a 24 bits image (ex. bitmap). The formats supported range from gif, bitmap, Tiff, Geotiff, Idrisi, Surfer, PCI, Erdas Imagine, Geosoft, ... to ArcGIS grids (ArcInfo binary format).
Check it out at:
http://www.geomaticssystems.com/Products/GTPMapInfo.htm
A 10 days fully functioning version is available at:
http://www.geomaticssystems.com/Products/GTPMapInfoTryIt.htm
Cheers
Ihab Hawater
Geomatics Systems Inc.
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