---
title: "init(calibratedGrayWhitePoint:blackPoint:gamma:)"
framework: coregraphics
role: symbol
role_heading: Initializer
path: "coregraphics/cgcolorspace/init(calibratedgraywhitepoint:blackpoint:gamma:)"
---

# init(calibratedGrayWhitePoint:blackPoint:gamma:)

Creates a calibrated grayscale color space.

## Declaration

```swift
init?(calibratedGrayWhitePoint whitePoint: UnsafePointer<CGFloat>, blackPoint: UnsafePointer<CGFloat>?, 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

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.

## Discussion

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.

## See Also

### Creating Color Spaces

- [init(calibratedRGBWhitePoint:blackPoint:gamma:matrix:)](coregraphics/cgcolorspace/init(calibratedrgbwhitepoint:blackpoint:gamma:matrix:).md)
- [init(iccBasedNComponents:range:profile:alternate:)](coregraphics/cgcolorspace/init(iccbasedncomponents:range:profile:alternate:).md)
- [init(indexedBaseSpace:last:colorTable:)](coregraphics/cgcolorspace/init(indexedbasespace:last:colortable:).md)
- [init(labWhitePoint:blackPoint:range:)](coregraphics/cgcolorspace/init(labwhitepoint:blackpoint:range:).md)
- [init(patternBaseSpace:)](coregraphics/cgcolorspace/init(patternbasespace:).md)
- [init(name:)](coregraphics/cgcolorspace/init(name:).md)
- [init(platformColorSpaceRef:)](coregraphics/cgcolorspace/init(platformcolorspaceref:).md)
- [init(iccData:)](coregraphics/cgcolorspace/init(iccdata:).md)
- [init(propertyListPlist:)](coregraphics/cgcolorspace/init(propertylistplist:).md)
- [CGColorSpaceCreateDeviceRGB()](coregraphics/cgcolorspacecreatedevicergb().md)
- [CGColorSpaceCreateDeviceCMYK()](coregraphics/cgcolorspacecreatedevicecmyk().md)
- [CGColorSpaceCreateDeviceGray()](coregraphics/cgcolorspacecreatedevicegray().md)
- [init(iccProfileData:)](coregraphics/cgcolorspace/init(iccprofiledata:).md)