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Before you project a pseudocolor image, you need to convert it to an ArcInfo grid with a colormap. You can then project the grid and convert it back to an image using the original colormap.
The colormap is an ASCII table that converts the grid's values to a specific RGB component for display.
Arc: IMAGEGRID img.tif img img.clr
Arc: PROJECT GRID img imgprj
Arc: GRIDIMAGE imgprj img.clr imgprj.tif TIFF