Quantity_TypeOfColor.hxx File Reference

Enumerations
enum	Quantity_TypeOfColor {   Quantity_TOC_RGB , Quantity_TOC_sRGB , Quantity_TOC_HLS , Quantity_TOC_CIELab ,   Quantity_TOC_CIELch }
	Identifies color definition systems. More...

Enumeration Type Documentation

Quantity_TypeOfColor

enum Quantity_TypeOfColor

Identifies color definition systems.

Enumerator
Quantity_TOC_RGB	Normalized linear RGB (red, green, blue) values within range [0..1] for each component.
Quantity_TOC_sRGB	Normalized non-linear gamma-shifted RGB (red, green, blue) values within range [0..1] for each component.
Quantity_TOC_HLS	Hue + light + saturation components, where: First component is the Hue (H) angle in degrees within range [0.0; 360.0], 0.0 being Red; value -1.0 is a special value reserved for grayscale color (S should be 0.0). Second component is the Lightness (L) within range [0.0; 1.0] Third component is the Saturation (S) within range [0.0; 1.0]
Quantity_TOC_CIELab	CIE L*a*b* color space, constructed to be perceptually uniform for human eye. The values are assumed to be with respect to D65 2° white point. The color is defined by: L: lightness in range [0, 100] (from black to white) a: green-to-red axis, approximately in range [-90, 100] b: blue-to-yellow axis, approximately in range [-110, 95] Note that not all combinations of L, a, and b values represent visible colors, and RGB cube takes only part of visible color space. When Lab color is converted to RGB, a and b components may be reduced (with the same proportion) to fit the result into the RGB range.
Quantity_TOC_CIELch	CIE L*c*h* color space, same as L*a*b* in cylindrical coordinates: L: lightness in range [0, 100] (from black to white) c: chroma, approximately in range [0, 135], 0 corresponds to greyscale h: hue angle, in range [0., 360.] The hue values of standard colors are approximately: red at 40, yellow at 103, green at 136, cyan at 196, blue at 306, magenta at 328. When Lch color is converted to RGB, chroma component may be reduced to fit the color into the RGB range.