<boolean id="oily" _label="Psychedelic Colors" arg-set="-oily"/>
+ <boolean id="gray" _label="Grayscale" arg-set="-grayscale"/>
+
<number id="ncolors" type="slider" arg="-colors %"
_low-label="Colors Two" _high-label="Many"
low="1" high="255" default="200"/>