# Transforming with polynomials Use polynomials to apply color transformations to images. ## Discussion Polynomial functions apply one or more polynomials to the input image to generate the output image. You can use polynomial functions to apply tone curve adjustments to images. ## Topics ### Applying a polynomial [`func vImagePiecewisePolynomial_Planar8toPlanarF(UnsafePointer, UnsafePointer, UnsafeMutablePointer?>, UnsafePointer, UInt32, UInt32, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImagePiecewisePolynomial_Planar8toPlanarF(_:_:_:_:_:_:_:)) Applies a set of piecewise polynomials to transform an 8-bit planar image to a 32-bit planar image. [`func vImagePiecewisePolynomial_PlanarFtoPlanar8(UnsafePointer, UnsafePointer, UnsafeMutablePointer?>, UnsafePointer, UInt32, UInt32, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImagePiecewisePolynomial_PlanarFtoPlanar8(_:_:_:_:_:_:_:)) Applies a set of piecewise polynomials to transform a 32-bit planar image to an 8-bit planar image. [`func vImagePiecewisePolynomial_PlanarF(UnsafePointer, UnsafePointer, UnsafeMutablePointer?>, UnsafePointer, UInt32, UInt32, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImagePiecewisePolynomial_PlanarF(_:_:_:_:_:_:_:)) Applies a set of piecewise polynomials to transform a 32-bit planar image. ### Applying a symmetric polynomial [`func vImageSymmetricPiecewisePolynomial_PlanarF(UnsafePointer, UnsafePointer, UnsafeMutablePointer?>, UnsafePointer, UInt32, UInt32, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageSymmetricPiecewisePolynomial_PlanarF(_:_:_:_:_:_:_:)) Applies a set of symmetric piecewise polynomials to transform a 32-bit planar image. ### Applying a rational expression [`func vImagePiecewiseRational_PlanarF(UnsafePointer, UnsafePointer, UnsafeMutablePointer?>, UnsafeMutablePointer?>, UnsafePointer, UInt32, UInt32, UInt32, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImagePiecewiseRational_PlanarF(_:_:_:_:_:_:_:_:_:)) Applies a set of piecewise rational expressions 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)