Band Combining and Separating
Not to be confused with mosaicking, band combining is a raster structural operation that allows for the combination of bands to form multiple rasters into one raster. The values of each band remain unchanged and the spatial relationship required is equivalent resolution and extents between all input rasters. This is useful in situations such as when one wants to combine three individual one-band rasters combined into a single three-band raster.
Conversely, separating a raster with multiple bands and palettes is also supported and can be employed to write multi-band or multi-palette rasters to destination formats that support only single-band or single-palette output.