Contents

init(calibratedRGBWhitePoint:blackPoint:gamma:matrix:)

Creates a calibrated RGB color space.

Declaration

init?(calibratedRGBWhitePoint whitePoint: UnsafePointer<CGFloat>, blackPoint: UnsafePointer<CGFloat>?, gamma: UnsafePointer<CGFloat>?, matrix: UnsafePointer<CGFloat>?)

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, or NULL if unsuccessful. In Objective-C, you’re responsible for releasing this object by calling CGColorSpaceRelease.

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 init(iccBasedNComponents:range:profile:alternate:) instead, because it can accurately represent these gamma curves.

See Also

Creating Color Spaces