ng chroma, a simple
strategy would be to pick a single hue (via <code>h</code> or <code>h1</code>) and then decrease
chroma from some value (<code>c</code> or <code>c1</code>) to zero (i.e., gray) along with
increasing luminance. For bringing out the extremes (a dark high-chroma color vs.
a light gray) this is already very effective. For distinguishing also colors in the
middle two strategies can be employed: (a) Hue can be varied as well by specifying an
interval of hues in <code>h</code> (or beginning hue