Projecting a pseudocolor raster from one coordinate system to another can be done using the following steps.
Verify that the raster is a pseudocolor by checking its properties in ArcCatalog. The number of bands must be 1 and a colormap must be present.
- Convert the raster to an ESRI Grid and a colormap file using ArcToolbox > Conversion Tools > Import to Raster > Image to Grid. Specify the name of the output grid and the name of the output colormap file.
The colormap file should have a .CLR extension.
- Define a projection for the grid using ArcToolbox > Data Management Tools > Projections > Define Projection Wizard such as coverages, grids, TINs.
- Project the grid using ArcToolbox > Data Management Tools > Projections > Project Wizard such as coverages and grids.
- Convert the projected grid and colormap back into an image using ArcInfo Workstation GRIDIMAGE command:
Arc: GRIDIMAGE mygrdprj colormap.clr newimage.tif TIFF
At ArcGIS 8.x there is a known problem with the ArcToolbox Grid to Image tool that does not allow it to use a colormap file for TIFFs.