# CGSetDisplayTransferByByteTable(_:_:_:_:_:) Sets the byte values in the 8-bit RGB gamma tables for a display. ``` func CGSetDisplayTransferByByteTable(_ 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 byte values of the red channel in the display’s gamma table. `greenTable` An array of size `tableSize` containing the byte values of the green channel in the display’s gamma table. `blueTable` An array of size `tableSize` containing the byte values of the blue channel in the display’s gamma table. ## 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)