# getRed(_:green:blue:alpha:) Returns the color object’s RGB component and opacity values in the respective arguments. ``` func getRed(_ red: UnsafeMutablePointer?, green: UnsafeMutablePointer?, blue: UnsafeMutablePointer?, alpha: UnsafeMutablePointer?) ``` ## Parameters `red` Upon return, contains the red component of the color object. `green` Upon return, contains the green component of the color object. `blue` Upon return, contains the blue component of the color object. `alpha` Upon return, contains the opacity value of the color object. ## Discussion If `NULL` is passed in as an argument, the method doesn’t set that value. This method works only with objects representing colors in the [`calibratedRGB`](/documentation/AppKit/NSColorSpaceName/calibratedRGB) or [`deviceRGB`](/documentation/AppKit/NSColorSpaceName/deviceRGB) color space. Sending it to other objects raises an exception. ## See Also [`blueComponent`](/documentation/AppKit/NSColor/blueComponent) The blue component value of the color. [`redComponent`](/documentation/AppKit/NSColor/redComponent) The red component value of the color. [`alphaComponent`](/documentation/AppKit/NSColor/alphaComponent) The alpha (opacity) component value of the color. [`greenComponent`](/documentation/AppKit/NSColor/greenComponent) The green component value of the color. --- 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)