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>euclid -MAPPING=C                ## the original 1021 color ramp
>euclid -MAPPING=C -CENTER        ## Same centered
...
>euclid -MAPPING=CE -CENTER
>euclid -MAPPING=BW               ## A grey scale
>euclid -MAPPING=BW -CENTER

#! perl -slw
use strict;
...
    $v = ( $v - $vmin ) / ( $vmax - $vmin );
    return rgb2n( ( $v * 255 ) x 3 );
}