Show Heatmaps with per pixel information

[ap--]

So currently there's not a particularly nice way to accomplish this in qupath...

refer to this image.sc post to see two additional options.

option (1) overlays a whole image on top of the other, but the transparency settings are a few clicks away in a menu (so this might be less than ideal for supporting annotators in a dynamic way)
option (2) can only be used to show overlayed pixel data in the current view and would need to be enhanced with eventlisteners to dynamically update whats drawn in the window dependend on zoom, position, windowsize, etc...

So both require additional code to be added to qupath.

• (1) a keyboard shortcut to toggle full transparency might already do.
• (2) a lot more java work to have full functionality.

A third option might be to use the currently implemented method and draw a tile per pixel.
I'll have to check if that is still performant.

A fourth option would be to quantize the heatmap and draw polygonal shapes corresponding to each value (something like an abstract terrain view). This is currently my preferred option.

But all of that depends on the amount of high frequency information in the heatmap that needs to be displayed.