Displaying custom data on hover for RGBA image #8668
Description
It would be nice to be possible to show some sort of information on RGBA images using Bokeh (https://stackoverflow.com/questions/54753032/hover-image-rgba-bokeh/54753614#54753614).
For instance, I'm working on a project in which we provide an RGBA image where the alpha represents some sort of confidence. We would like, when hovering an image pixel, to be able to show this confidence (in this case, the rgba[:,:,3] value).