Hi, 

I've got a pg.ImageItem() on pg.GraphicsLayoutWidet().

The image item is a heat map of a surface layed out in 2d (x, y) with the 
map's heat indicating magnitude in the z direction.  Pretty standard stuff. 

The heat map has a moving cross hair that tracks mouse activity in the 
region on top of it. 

I have annotating data for the heat map such that I would like to draw some 
scatter plots over top of the ImageItem to indicate data quality at 
specific points on the map.

Another way to do it might be to draw multiple images on top of the heat 
map with transparency, wherever no annotations exist, to allow the colours 
of the first heat map to be visible. 

Are either of these options possible?   Is there another way I might 
achieve my goal?

Nick 

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