You can convert one or more REM objects to a new raster image.
If you select more than one REM object, AutoCAD Raster Design toolset merges all REM objects into one new image.
If the raster image was created from a REM polygonal or diagonal region, the image is clipped to match the geometry of the REM object. Raster data that falls outside the clip, but within the boundary of the image, is set to the transparent color.
If you select REM objects from images with different properties (for example, images with different color depths and densities) and convert the objects to a new image, the properties of the new image are determined by the first REM object you select.