Hi!

I wonder if it is possible to plot a second int[,] 2D array over a heatmap, with Alpha opacity, and RGB color?
So this second "heatmap" is actually not a heatmap, but a fixed color overlay, where there are some NULL values where we want total transparency (full view of the underlaying real heatmap), and fixed values representing the RBG color.

I understand that, I could somehow hack together the heatmap's colorbar in a way, so when I clip the int[,] finite values they get the required color, but then this will affect the real heatmap too.

Maybe someone can bring up some workaround? Maybe a new Plottable type could be useful, like a limited heatmap? Or a special Heatmap with fixed color? --> Plot.AddFixColorMap(boolArray, double alpha, double red, double blue, double green);
Where bool[,] boolArray is a bool matrix, with False values at positions where we want total transparency, and the given opacity alpha level and color at the True values to render?

I also consider to create a special Bitmap, and plot it over the heatmap, but this might not be the best approach? -->
https://learn.microsoft.com/en-us/dotnet/desktop/winforms/advanced/how-to-use-a-color-matrix-to-set-alpha-values-in-images?view=netframeworkdesktop-4.8

Thanks for any suggestions! :)