Instance Method

getWhite:alpha:

Returns the grayscale components of the color.

Declaration

- (BOOL)getWhite:(CGFloat *)white alpha:(CGFloat *)alpha;

Parameters

white

On return, the grayscale component of the color object. On applications linked for iOS 10 or later, the grayscale component is specified in an extended range gray color space and can have any value. Values between 0.0 and 1.0 are inside the sRGB color gamut. On earlier versions of iOS, the specified value is always between 0.0 and 1.0.

alpha

On return, the opacity component of the color object, specified as a value between 0.0 and 1.0.

Return Value

YES if the color could be converted, NO otherwise.

Discussion

If the color is in a compatible color space, the color is converted into grayscale format and returned to your application. If the color is not in a compatible color space, the parameters are unchanged.

See Also

Getting the Color Information

CGColor

The Quartz color reference that corresponds to the receiver’s color.

- CGColor

The Quartz color reference that corresponds to the receiver’s color.

CIColor

The Core Image color associated with the receiver.

- getHue:saturation:brightness:alpha:

Returns the components that make up the color in the HSB color space.

- getRed:green:blue:alpha:

Returns the components that make up the color in the RGB color space.