An integer of 24 bits, in which the upper 8 bits represent the red
channel, the middle 8 bits the green, and the lower 8 bits the blue
channel.
A color name from the list TOOTSVILLE +COLOR24-NAMES+. Spaces are interchangeable
with hyphens and the value is not case-sensitive.
An RGB byte-value triplet as in CSS, of the form
rgb(R,G,B), where R, G, and B are unsigned 8-bit
decimal integers, i.e. values from 0-255.
An HTML-style hex color code in the form #RGB or #RRGGBB.
When only three hex digits are provided, each is doubled to
form an unsigned 8-bit value; thus, #abc is the same as
#aabbcc.
A set of 6 hex digits of the same form rrggbb as
the HTML form #rrggbb, without any sigil.