Hello, I am using colormap to realize the PRPD map in the field of partial discharge. I have two questions to ask how to achieve it:
1. I customized the color scale, the defined range is (1-6), I want to display the background color (black) when there is no data, instead of displaying the color with the smallest color scale bar.
2. I want to add a sine wave reference curve on the colormap and overlay it on the colormap. I tried addgraph and found that the curve was covered.