Function

CGColorSpaceCreateCalibratedRGB

Creates a calibrated RGB color space.

Declaration

CGColorSpaceRef CGColorSpaceCreateCalibratedRGB(const CGFloat *whitePoint, const CGFloat *blackPoint, const CGFloat *gamma, const CGFloat *matrix);

Parameters

whitePoint

An array of 3 numbers specifying the tristimulus value, in the CIE 1931 XYZ-space, of the diffuse white point.

blackPoint

An array of 3 numbers specifying the tristimulus value, in CIE 1931 XYZ-space, of the diffuse black point.

gamma

An array of 3 numbers specifying the gamma for the red, green, and blue components of the color space.

matrix

An array of 9 numbers specifying the linear interpretation of the gamma-modified RGB values of the color space with respect to the final XYZ representation.

Return Value

A new calibrated RGB color space. You are responsible for releasing this object by calling CGColorSpaceRelease. If unsuccessful, returns NULL.

Discussion

Creates a device-independent RGB color space that represents colors relative to a reference white point. This white point is based on the whitest light that can be generated by the output device. Colors in a device-independent color space should appear the same when displayed on different devices, to the extent that the capabilities of the device allow.

For color spaces that require a detailed gamma, such as the piecewise transfer function used in sRGB or ITU-R BT.709, you may want to use the function CGColorSpaceCreateICCBased instead, because it can accurately represent these gamma curves.

See Also

Creating Device-Independent Color Spaces

CGColorSpaceCreateCalibratedGray

Creates a calibrated grayscale color space.

CGColorSpaceCreateICCBased

Creates a device-independent color space that is defined according to the ICC color profile specification.

CGColorSpaceCreateWithICCProfile

Creates an ICC-based color space using the ICC profile contained in the specified data.

Deprecated
CGColorSpaceCreateLab

Creates a device-independent color space that is relative to human color perception, according to the CIE L*a*b* standard.