# Transforming with a gamma function Use gamma functions to apply color transformations to images. ## Discussion Gamma correction functions correct the brightness profile of an image by applying an exponent to each pixel in an image. The piecewise gamma correction functions allow you to add a linear transformation to pixels below a certain boundary. You can use gamma correction functions to prepare an image to display or print on a particular device. ## Topics ### Applying a gamma function [`func vImageCreateGammaFunction(Float, Int32, vImage_Flags) -> GammaFunction!`](/documentation/Accelerate/vImageCreateGammaFunction(_:_:_:)) Returns a gamma function object. [`func vImageGamma_Planar8toPlanarF(UnsafePointer, UnsafePointer, GammaFunction!, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageGamma_Planar8toPlanarF(_:_:_:_:)) Applies a gamma function to an 8-bit planar image to produce a 32-bit planar image. [`func vImageGamma_PlanarFtoPlanar8(UnsafePointer, UnsafePointer, GammaFunction!, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageGamma_PlanarFtoPlanar8(_:_:_:_:)) Applies a gamma function to a 32-bit planar image to produce an 8-bit planar image. [`func vImageGamma_PlanarF(UnsafePointer, UnsafePointer, GammaFunction!, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageGamma_PlanarF(_:_:_:_:)) Applies a gamma function to a PlanarF image. [`func vImageDestroyGammaFunction(GammaFunction!)`](/documentation/Accelerate/vImageDestroyGammaFunction(_:)) Destroys a gamma function object. ### Applying a piecewise gamma function [`func vImagePiecewiseGamma_Planar8(UnsafePointer, UnsafePointer, UnsafePointer, Float, UnsafePointer, Pixel_8, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImagePiecewiseGamma_Planar8(_:_:_:_:_:_:_:)) Applies a piecewise gamma function to transform an 8-bit planar image. [`func vImagePiecewiseGamma_Planar8toPlanar16Q12(UnsafePointer, UnsafePointer, UnsafePointer, Float, UnsafePointer, Pixel_8, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImagePiecewiseGamma_Planar8toPlanar16Q12(_:_:_:_:_:_:_:)) Applies a piecewise gamma function to transform an 8-bit planar image to a 16Q12 planar image. [`func vImagePiecewiseGamma_Planar8toPlanarF(UnsafePointer, UnsafePointer, UnsafePointer, Float, UnsafePointer, Pixel_8, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImagePiecewiseGamma_Planar8toPlanarF(_:_:_:_:_:_:_:)) Applies a piecewise gamma function to transform an 8-bit planar image to a 32-bit planar image. [`func vImagePiecewiseGamma_Planar16Q12(UnsafePointer, UnsafePointer, UnsafePointer, Float, UnsafePointer, Pixel_16S, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImagePiecewiseGamma_Planar16Q12(_:_:_:_:_:_:_:)) Applies a piecewise gamma function to transform a 16Q12 planar image. [`func vImagePiecewiseGamma_Planar16Q12toPlanar8(UnsafePointer, UnsafePointer, UnsafePointer, Float, UnsafePointer, Pixel_16S, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImagePiecewiseGamma_Planar16Q12toPlanar8(_:_:_:_:_:_:_:)) Applies a piecewise gamma function to transform a 16Q12 planar image to an 8-bit planar image. [`func vImagePiecewiseGamma_PlanarF(UnsafePointer, UnsafePointer, UnsafePointer, Float, UnsafePointer, Float, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImagePiecewiseGamma_PlanarF(_:_:_:_:_:_:_:)) Applies a piecewise gamma function to transform a 32-bit planar image. [`func vImagePiecewiseGamma_PlanarFtoPlanar8(UnsafePointer, UnsafePointer, UnsafePointer, Float, UnsafePointer, Float, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImagePiecewiseGamma_PlanarFtoPlanar8(_:_:_:_:_:_:_:)) Applies a piecewise gamma function to transform a 32-bit planar image to an 8-bit planar image. ### Applying a symmetric piecewise gamma function [`func vImageSymmetricPiecewiseGamma_Planar16Q12(UnsafePointer, UnsafePointer, UnsafePointer, Float, UnsafePointer, Pixel_16S, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageSymmetricPiecewiseGamma_Planar16Q12(_:_:_:_:_:_:_:)) Applies a symmetric piecewise gamma function to transform a 16Q12 planar image to an 8-bit planar image. [`func vImageSymmetricPiecewiseGamma_PlanarF(UnsafePointer, UnsafePointer, UnsafePointer, Float, UnsafePointer, Float, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageSymmetricPiecewiseGamma_PlanarF(_:_:_:_:_:_:_:)) Applies a symmetric piecewise gamma function to transform a 32-bit planar image. --- 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)