# init(calibratedGrayWhitePoint:blackPoint:gamma:) Creates a calibrated grayscale color space. ``` init?(calibratedGrayWhitePoint whitePoint: UnsafePointer, blackPoint: UnsafePointer?, gamma: 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` The gamma value appropriate for the imaging device. ## Return Value A new calibrated gray color space, or `NULL` if unsuccessful. In Objective-C, you’re responsible for releasing this object by calling [`CGColorSpaceRelease`](/documentation/CoreGraphics/CGColorSpaceRelease). ## Discussion Creates a device-independent grayscale 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. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)