Colours

All colours are specified in terms of a 24-bit colour value, represented by the class TRgb. This 24 bit value is mapped down to device-level values by the graphics device or printer driver.

Note that:

• Colours can be specified logically (for example the window background colour), as well as physically. The UI Graphics Utilities API contains a list of logical colours (TLogicalColor) and provides the means to convert them into RGB values.

• The window server defines display modes that represent colour resolutions. In each display mode, as enumerated by TDisplayMode, a unique index can represent each physical colour supported. TRgb can map such indices onto a full RGB value.