Hello,

(This is a different question for the same project that led me to file a
bug about alpha blending in "contour" .)

I want to overlay a number of exclusion regions in a 2D parameter scan.
I generate each region with contourf in succession, like:

    contourf(x,y,unphys,(1),alpha=1,colors=('w','k'))
    contourf(x,y,excl,(1),alpha=0.5,colors=('w','m'))
    ...

The problem as you might guess is that if I overlay many regions, the
white level at each new region washes out the underlying non-white
colors.

Is there a "transparent" color I can use instead of white?  Or, is there
an alternative way to overlay regions that avoids this problem?

Thank you again!


Best,

Sourav




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