No, there are no colormaps present. They are 16bit tiffs with 4 bands present, and within ArcMap, on the Symbology tab of the raster properties, I'm setting the Red, Green, and Blue channels to the band combination that I want to display and then using the Export Raster Data tool to convert it to 3 band, 8bit tiffs. It would be great if I could write a script that would loop through all the rasters in the TOC and export them using the same settings, instead of doing each separately.