# Transforming with matrix multiplication Use matrix multiplication to apply color transformations to images. ## Discussion Matrix multiplication functions treat source pixels as `m`-element vectors, with the number of vector elements corresponding to the number of channels. The functions multiply each source value by an `n x m` matrix to produce an `n`-element destination pixel. You can use matrix multiplication functions for tasks like converting between color spaces. For example, you can multiply three-channel RGB pixels by a 4 x 3 matrix to generate four-channel CMYK pixels. ## Topics ### Multiplying multiple-plane pixels by a matrix [`func vImageMatrixMultiply_Planar8(UnsafeMutablePointer?>, UnsafeMutablePointer?>, UInt32, UInt32, UnsafePointer, Int32, UnsafePointer!, UnsafePointer!, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageMatrixMultiply_Planar8(_:_:_:_:_:_:_:_:_:)) Multiplies each pixel in a set of 8-bit source image planes by a matrix to produce a set of 8-bit destination image planes. [`func vImageMatrixMultiply_Planar16S(UnsafeMutablePointer?>, UnsafeMutablePointer?>, UInt32, UInt32, UnsafePointer, Int32, UnsafePointer!, UnsafePointer!, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageMatrixMultiply_Planar16S(_:_:_:_:_:_:_:_:_:)) Multiplies each pixel in a set of 16-bit source image planes by a matrix to produce a set of 8-bit destination image planes. [`func vImageMatrixMultiply_PlanarF(UnsafeMutablePointer?>, UnsafeMutablePointer?>, UInt32, UInt32, UnsafePointer, UnsafePointer!, UnsafePointer!, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageMatrixMultiply_PlanarF(_:_:_:_:_:_:_:_:)) Multiplies each pixel in a set of 32-bit source image planes by a matrix to produce a set of 32-bit destination image planes. ### Multiplying interleaved pixels by a matrix [`func vImageMatrixMultiply_ARGB8888(UnsafePointer, UnsafePointer, UnsafePointer, Int32, UnsafePointer!, UnsafePointer!, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageMatrixMultiply_ARGB8888(_:_:_:_:_:_:_:)) Multiplies each pixel in an interleaved four-channel, 8-bit source image by a matrix to produce an interleaved four-channel, 8-bit destination image. [`func vImageMatrixMultiply_ARGBFFFF(UnsafePointer, UnsafePointer, UnsafePointer, UnsafePointer!, UnsafePointer!, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageMatrixMultiply_ARGBFFFF(_:_:_:_:_:_:)) Multiplies each pixel in an interleaved four-channel, 32-bit source image by a matrix to produce an interleaved four-channel, 32-bit destination image. [`func vImageMatrixMultiply_ARGB8888ToPlanar8(UnsafePointer, UnsafePointer, UnsafePointer, Int32, UnsafePointer!, Int32, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageMatrixMultiply_ARGB8888ToPlanar8(_:_:_:_:_:_:_:)) Multiplies each pixel in an interleaved four-channel, 8-bit source image by a matrix to produce a planar 8-bit destination image. [`func vImageMatrixMultiply_ARGBFFFFToPlanarF(UnsafePointer, UnsafePointer, UnsafePointer, UnsafePointer!, Float, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageMatrixMultiply_ARGBFFFFToPlanarF(_:_:_:_:_:_:)) Multiplies each pixel in an interleaved four-channel, 32-bit source image by a matrix to produce a planar 32-bit destination 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)