The rgb_color class is a basic structure for storing a color value, including opacity/transparency.
The red component of the color. Values can range from 0 to 255.
The green component of the color. Values can range from 0 to 255.
The blue component of the color. Values can range from 0 to 255.
The alpha (or opacity) component of the color. Values can range from 0 to 255. An alpha of 0 is a totally transparent color, while a value of 255 indicates a totally opaque color.
(none)