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I am trying to change a 3 band RGB raster to a 1 band raster with ArcGIS Desktop 10.7.1 in the same way that gdal does with the RGB2PCT Tool. I have large scale topographic map tiles which take up a lot of disk space. I would like to reduce the volume of data by creating small good quality 1 band 8 bit rasters with a color palette. RGB2PCT does this well. But I have to use ArcGIS Desktop.

Is this possible with ArcMap 10.7.1?

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RGB raster can be converted into single band 8 bit image with a colormap by using the Copy Raster tool from the Raster Dataset toolset that is part of Data Management toolbox. See documentation https://desktop.arcgis.com/en/arcmap/latest/tools/data-management-toolbox/copy-raster.htm.

RGB_to_Colormap (Optional)

Convert an 8-bit, 3-band (RGB) raster dataset to a single-band raster dataset with a color map. This operation suppresses noise that is often found in scanned images and is ideal for screen captures, scanned maps, or scanned documents. This is not recommended for satellite or aerial imagery or thematic raster data.

NONE —Do not convert RGB.

RGBToColormap —Convert to color map.

The tool is available at all licensing levels.

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