# Applying color transforms to pixel buffers Adjust the colors of an image by applying gamma, polynomials, or multidimensional lookup. ## Topics ### Applying gamma [`func applyGamma(vImage.Gamma, intermediateBuffer: vImage.PixelBuffer?, destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyGamma(_:intermediateBuffer:destination:)-1fif9) Applies a gamma function to an 8-bit planar pixel buffer. [`func applyGamma(vImage.Gamma, intermediateBuffer: vImage.PixelBuffer?, destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyGamma(_:intermediateBuffer:destination:)-390k5) Applies a gamma function to an 8-bit-per-channel, 2-channel interleaved pixel buffer. [`func applyGamma(vImage.Gamma, intermediateBuffer: vImage.PixelBuffer?, destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyGamma(_:intermediateBuffer:destination:)-3yu0w) Applies a gamma function to an 8-bit-per-channel, 3-channel interleaved pixel buffer. [`func applyGamma(vImage.Gamma, intermediateBuffer: vImage.PixelBuffer?, destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyGamma(_:intermediateBuffer:destination:)-wsww) Applies a gamma function to an 8-bit-per-channel, 4-channel interleaved pixel buffer. [`func applyGamma(vImage.Gamma, destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyGamma(_:destination:)) Applies a gamma function to a 32-bit pixel buffer. [`enum Gamma`](/documentation/Accelerate/vImage/Gamma) Describes either a used-defined or constant gamma. ### Applying piecewise gamma [`func applyGamma(linearParameters: (scale: Float, bias: Float), exponentialParameters: (scale: Float, preBias: Float, gamma: Float, postBias: Float), boundary: Pixel_8, destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyGamma(linearParameters:exponentialParameters:boundary:destination:)-249w5) Applies a piecewise gamma calculation to an 8-bit pixel buffer. [`func applyGamma(linearParameters: (scale: Float, bias: Float), exponentialParameters: (scale: Float, preBias: Float, gamma: Float, postBias: Float), boundary: Float, destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyGamma(linearParameters:exponentialParameters:boundary:destination:)-8r0ro) Applies a piecewise gamma calculation to a 32-bit pixel buffer. ### Appying polynomial (32-bit source, 8-bit destination) [`func applyPolynomial(coefficientSegments: [[Float]], boundaries: [Float], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyPolynomial(coefficientSegments:boundaries:destination:)-3b0d0) Applies a set of piecewise polynomials to a 32-bit planar buffer and writes the result to an 8-bit planar buffer. [`func applyPolynomial(coefficientSegments: [[Float]], boundaries: [Float], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyPolynomial(coefficientSegments:boundaries:destination:)-6uls3) Applies a set of piecewise polynomials to a 2-channel, 32-bit interleaved buffer and writes the result to a 2-channel, 8-bit interleaved buffer. [`func applyPolynomial(coefficientSegments: [[Float]], boundaries: [Float], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyPolynomial(coefficientSegments:boundaries:destination:)-4r6nf) Applies a set of piecewise polynomials to a 3-channel, 32-bit interleaved buffer and writes the result to a 3-channel, 8-bit interleaved buffer. [`func applyPolynomial(coefficientSegments: [[Float]], boundaries: [Float], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyPolynomial(coefficientSegments:boundaries:destination:)-1b2nu) Applies a set of piecewise polynomials to a 4-channel, 32-bit interleaved buffer and writes the result to a 4-channel, 8-bit interleaved buffer. ### Appying polynomial (8-bit source, 32-bit destination) [`func applyPolynomial(coefficientSegments: [[Float]], boundaries: [Float], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyPolynomial(coefficientSegments:boundaries:destination:)-7sy2t) Applies a set of piecewise polynomials to an 8-bit planar buffer and writes the result to a 32-bit planar buffer. [`func applyPolynomial(coefficientSegments: [[Float]], boundaries: [Float], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyPolynomial(coefficientSegments:boundaries:destination:)-3sxxv) Applies a set of piecewise polynomials to a 2-channel, 8-bit interleaved buffer and writes the result to a 2-channel, 32-bit interleaved buffer. [`func applyPolynomial(coefficientSegments: [[Float]], boundaries: [Float], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyPolynomial(coefficientSegments:boundaries:destination:)-4o5ju) Applies a set of piecewise polynomials to a 3-channel, 8-bit interleaved buffer and writes the result to a 3-channel, 32-bit interleaved buffer. [`func applyPolynomial(coefficientSegments: [[Float]], boundaries: [Float], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyPolynomial(coefficientSegments:boundaries:destination:)-6ohrj) Applies a set of piecewise polynomials to a 4-channel, 8-bit interleaved buffer and writes the result to a 4-channel, 32-bit interleaved buffer. ### Appying polynomial (32-bit) [`func applyPolynomial(coefficientSegments: [[Float]], boundaries: [Float], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyPolynomial(coefficientSegments:boundaries:destination:)-3c46t) Applies a set of piecewise polynomials to a 32-bit planar buffer. [`func applyPolynomial(coefficientSegments: [[Float]], boundaries: [Float], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyPolynomial(coefficientSegments:boundaries:destination:)-8f5i9) Applies a set of piecewise polynomials to a 2-channel, 32-bit interleaved buffer. [`func applyPolynomial(coefficientSegments: [[Float]], boundaries: [Float], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyPolynomial(coefficientSegments:boundaries:destination:)-26zom) Applies a set of piecewise polynomials to a 3-channel, 32-bit interleaved buffer. [`func applyPolynomial(coefficientSegments: [[Float]], boundaries: [Float], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyPolynomial(coefficientSegments:boundaries:destination:)-8uesn) Applies a set of piecewise polynomials to a 4-channel, 32-bit interleaved buffer. ### Transforming with a lookup table [`func applyLookup([Pixel_8], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyLookup(_:destination:)-5r7bq) Applies a lookup table to transform an 8-bit planar image. [`func applyLookup([Pixel_F], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyLookup(_:destination:)-14pjo) Applies a lookup table to transform an 8-bit planar image to a 32-bit planar image. [`func applyLookup([Pixel_16U], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyLookup(_:destination:)-5oi4o) Applies a lookup table to transform an 8-bit planar image to a 16-bit planar image. [`func applyLookup([Pixel_8888], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyLookup(_:destination:)-3ruls) Applies a lookup table to transform an 8-bit planar image to an 8-bit-per-channel, three-channel interleaved image. [`func applyLookup([Pixel_FFFF], destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyLookup(_:destination:)-1tsb5) Applies a lookup table to transform an 8-bit planar image to a 32-bit-per-channel, three-channel interleaved image. [`func applyLookup(alphaTable: [Pixel_8]?, redTable: [Pixel_8]?, greenTable: [Pixel_8]?, blueTable: [Pixel_8]?, destination: vImage.PixelBuffer)`](/documentation/Accelerate/vImage/PixelBuffer/applyLookup(alphaTable:redTable:greenTable:blueTable:destination:)) Applies a set of four lookup tables to transform an interleaved, four-channel 8-bit image. ### Transforming with a multidimensional lookup table [`struct MultidimensionalLookupTable`](/documentation/Accelerate/vImage/MultidimensionalLookupTable) A multidimensional lookup table. ### Applying a flood fill to an image [`func floodFill(from: CGPoint, newColor: Pixel_8, connectivity: vImage.FloodFillConnectivity)`](/documentation/Accelerate/vImage/PixelBuffer/floodFill(from:newColor:connectivity:)-44z7t) Applies an in-place flood-fill operation to the 8-bit planar image. [`func floodFill(from: CGPoint, newColor: Pixel_8888, connectivity: vImage.FloodFillConnectivity)`](/documentation/Accelerate/vImage/PixelBuffer/floodFill(from:newColor:connectivity:)-56w4b) Applies an in-place flood-fill operation to the interleaved 4-channel, 8-bit-per-pixel image. [`func floodFill(from: CGPoint, newColor: Pixel_16U, connectivity: vImage.FloodFillConnectivity)`](/documentation/Accelerate/vImage/PixelBuffer/floodFill(from:newColor:connectivity:)-219lg) Applies an in-place flood-fill operation to the unsigned 16-bit planar image. [`func floodFill(from: CGPoint, newColor: Pixel_ARGB_16U, connectivity: vImage.FloodFillConnectivity)`](/documentation/Accelerate/vImage/PixelBuffer/floodFill(from:newColor:connectivity:)-6hsrg) Applies an in-place flood-fill operation to the interleaved 4-channel, unsigned16-bit-per-pixel image. --- Copyright © 2026 Apple Inc. 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