We would like to have the option to add a custom Color Ramp under the Image Display menu.
In-house we are currently using the following color ramp to display bathymetry datasets.
The raw bathymetry data will look like this in AGOL
By using a raster function we can create a bathymetry layer that uses this color ramp. The drawback of this is that in the legend it will show as RGB rather than a color ramp with the man & max values next to it.
But what we really would like is the functionality to add in-house color ramps to the pulldown list as well as the option to invert them, such that the customer can create his own look and feel of his web maps.