QuickTime 4 Reference

About Ink Objects

An ink object exists to provide color information about a shape. Each QuickDraw GX shape consists of a shape object, a style object, an ink object, and a transform object; the ink object associated with a shape defines the color with which the shape is drawn, as well as the transfer mode used to draw it.

Inks are device independent. Their information is not affected by the properties of the display device to which the shapes they modify are drawn. When it draws a shape on a device, QuickDraw GX approximates as closely as possible the color specified by the shape's ink.