BUG
** This issue is addressed in ArcGIS 9.1 Service Pack 1 (SP1) **
TIFFs with CCITT G4 and PackBits TIFF compression do not display properly in ArcMap or ArcCatalog. Support for these TIFF compression types is disabled.
This is a known issue.
Note: This issue is addressed in ArcGIS 9.1 Service Pack 1 (SP1).
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