I am trying to make a DEM google earth file with illumination. Below are the scripts that I used. There seems to be a conflict between illumination option and the -Q in grdimage.
gmt grd2kml dem.grd -Cgray -Ntest -I+a270
The error message is this:
grdimage [ERROR]: Option -Q: Cannot specify a transparent color for grids when intensities are also used