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The GRIDIMAGE Workstation command produces a BSQ, BIL or BIP raster from a multiband RGB grid stack, but the raster displays in black and white, or otherwise does not match the appearance of the original stack.
The default enhancement that is applied to rasters may cause this problem if the stack is essentially a 'thematic unique value multiband' (the color components of each zone are recorded separately in the respective bands). When there are only a few zones in the stack, the enhancement produces the undesirable results.
There are several possible workarounds: