Volume rendering shows grayscale even if RGB dicom is loaded

Dear all,

I have loaded 'RGB" dicom file into 3D slicer. The axial, coronal and sagittal views show RGB rendered slices. But the volume rendering shows ‘Gray scale’ volume. I check with Volumes tab in the slicer and tried to change. But it did not work.

What work around needs to be done here? I have attached the image for reference.

Sunag R A