These operators let rules and actions manipulate color attribute values. It can often convenient to tie the color of a note to its properties - for example, to make overdue tasks bright red. For example, you can make overdue notes red, with a brightness proportional to how overdue they are.
Note that when setting a shade of a named color in a string the shade value (lighter, darkest, etc.) comes before the color, unlike listings in Info view and the Rename dialog; thus "dark warm gray" not "warm gray dark", "light cyan" not "cyan light".
For example
rgb($MyRed,255,255)
$Color = brightness(hue(RGB(255,0,0),120),75)
