X11

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Get Background color of shell

This is a hack. I'm still working on this.

Should be average color, but seems to be more like median. Pretty fast: 

time xwd -silent -nobdrs -id $WINDOWID | convert - -gravity center -crop 1x1+0+0 -depth 8 txt:-

Average, Slower: 

time xwd -silent -nobdrs -id $WINDOWID | convert - -colors 1 -crop 1x1+0+0 -depth 8 txt:-
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