quantize or normalize colors for gradient overlays of continuous variables

[danicahelb]

colormap is a true gradient, outliers are highlighted and everything else is washed out.

• for most overlay variables, this approach is good for exploring outliers but not useful for seeing differences in the distribution of the majority of the data.
• Consider dividing the overlay range into deciles of equal frequency, or some other approach. to be discussed in dataviz

WASHb BNG:

WASHb BNG:

GEMS1:

[danicahelb]

duplicates https://github.com/VEuPathDB/EdaDataService/issues/232. closing