Geoprocessing->ArcToolbox->Data Management Tools->Raster->Raster Dataset->Mosaic to New Raster, 打开Mosaic to New Raster对话框,在Pixel Type(Optional)的下拉列表中选择8bit即可。
菜单Geoprocessing->ArcToolbox->Data Management Tools->Raster->Raster Dataset->Mosaic to New Raster, 打开Mosaic to New Raster对话框,在Pixel Type(Optional)的下拉列表中选择8bit即可。如下图: