# CGSetDisplayTransferByTable(_:_:_:_:_:) Sets the color gamma function for a display by specifying the values in the RGB gamma tables. ``` func CGSetDisplayTransferByTable(_ display: CGDirectDisplayID, _ tableSize: UInt32, _ redTable: UnsafePointer?, _ greenTable: UnsafePointer?, _ blueTable: UnsafePointer?) -> CGError ``` ## Parameters `display` The identifier of the display to be accessed. `tableSize` The number of entries in each table. `redTable` An array of size `tableSize` containing the values of the red channel in the display’s gamma table. The values should be in the range `0.0` to `1.0`. `greenTable` An array of size `tableSize` containing the values of the green channel in the display’s gamma table. The values should be in the range `0.0` to `1.0`. `blueTable` An array of size `tableSize` containing the values of the blue channel in the display’s gamma table. The values should be in the range `0.0` to `1.0`. ## Return Value A result code. See `Core Graphics Data Types and Constants`. ## Discussion The same table may be passed in for the red, green, and blue channels. The tables are interpolated as needed to generate the number of samples required by the graphics hardware. --- 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)