Dear Lu, maybe you can take advantage from the transparency tool.

In ArcGis you can find it in Layer Properties-->Display. In ArcGis Pro transparency is under Appearance ribbon-->Effects.

Lu Zhu

Dear Lu,

Path to it:

Layer---->>>>Right Click------>>>>Properties------>>>Display-------->>>>Transparency

The path is shown in the figure.

Thank you all for the help! It works!

I used to try to manipulate the transparency of the color map. Did not think of trying the same to the hillside raster. It turned out way better. Thank you so much! Marco M. Sozzi and Mahmoud Rahimi