Grdimage: plot with 3 (rgb) grids

Hi GMT Users,

I have a question to make a plot with grdimage module.

The older versions of GMT would have allowed us to plot 3 different grid files. However, as I understand it has been turned off or modified as of version 6.2.

I need a that kind of plot and I am using the latest version. How can i deal with it? Is there an alternative way in the updated grdimage module?

Thank you in advance for all the answers.

see grdmix.