# Overwriting channels Overwrite the channels of a buffer. ## Topics ### Overwriting with another buffer [`func vImageSelectChannels_ARGB8888(UnsafePointer, UnsafePointer, UnsafePointer, UInt8, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageSelectChannels_ARGB8888(_:_:_:_:_:)) Overwrites the channels of an 8-bit-per-channel, 4-channel interleaved buffer with the specified channels of the corresponding pixels of a second buffer. [`func vImageSelectChannels_ARGBFFFF(UnsafePointer, UnsafePointer, UnsafePointer, UInt8, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageSelectChannels_ARGBFFFF(_:_:_:_:_:)) Overwrites the channels of a floating-point 32-bit-per-channel, 4-channel interleaved buffer with the specified channels of the corresponding pixels of a second buffer. [`func vImageOverwriteChannels_ARGB8888(UnsafePointer, UnsafePointer, UnsafePointer, UInt8, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageOverwriteChannels_ARGB8888(_:_:_:_:_:)) Overwrites the channels of an 8-bit-per-channel, 4-channel interleaved buffer with the corresponding pixels of a planar buffer. [`func vImageOverwriteChannels_ARGBFFFF(UnsafePointer, UnsafePointer, UnsafePointer, UInt8, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageOverwriteChannels_ARGBFFFF(_:_:_:_:_:)) Overwrites the channels of a floating-point 32-bit-per-channel, 4-channel interleaved buffer with the corresponding pixels of a planar buffer. ### Overwriting with pixel values [`func vImageOverwriteChannelsWithPixel_ARGB8888(UnsafePointer!, UnsafePointer, UnsafePointer, UInt8, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageOverwriteChannelsWithPixel_ARGB8888(_:_:_:_:_:)) Overwrites the channels of an 8-bit-per-channel, 4-channel interleaved buffer with the specified channels of a pixel value. [`func vImageOverwriteChannelsWithPixel_ARGB16U(UnsafePointer!, UnsafePointer, UnsafePointer, UInt8, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageOverwriteChannelsWithPixel_ARGB16U(_:_:_:_:_:)) Overwrites the channels of an unsigned 16-bit-per-channel, 4-channel interleaved buffer with the specified channels of a pixel value. [`func vImageOverwriteChannelsWithPixel_ARGBFFFF(UnsafePointer!, UnsafePointer, UnsafePointer, UInt8, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageOverwriteChannelsWithPixel_ARGBFFFF(_:_:_:_:_:)) Overwrites the channels of a floating-point 32-bit-per-channel, 4-channel interleaved buffer with the specified channels of a pixel value. ### Overwriting with scalar values [`func vImageOverwriteChannelsWithScalar_Planar8(Pixel_8, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageOverwriteChannelsWithScalar_Planar8(_:_:_:)) Overwrites an 8-bit planar buffer with the specified scalar value in place. [`func vImageOverwriteChannelsWithScalar_Planar16U(Pixel_16U, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageOverwriteChannelsWithScalar_Planar16U(_:_:_:)) Overwrites an unsigned 16-bit planar buffer with the specified scalar value in place. [`func vImageOverwriteChannelsWithScalar_Planar16S(Pixel_16S, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageOverwriteChannelsWithScalar_Planar16S(_:_:_:)) Overwrites a signed 16-bit planar buffer with the specified scalar value in place. [`func vImageOverwriteChannelsWithScalar_Planar16F(Pixel_16F, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageOverwriteChannelsWithScalar_Planar16F(_:_:_:)) Overwrites a floating-point 16-bit planar buffer with the specified scalar value in place. [`func vImageOverwriteChannelsWithScalar_PlanarF(Pixel_F, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageOverwriteChannelsWithScalar_PlanarF(_:_:_:)) Overwrites a floating-point 32-bit planar buffer with the specified scalar value in place. [`func vImageOverwriteChannelsWithScalar_ARGB8888(Pixel_8, UnsafePointer, UnsafePointer, UInt8, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageOverwriteChannelsWithScalar_ARGB8888(_:_:_:_:_:)) Overwrites the selected channels of an 8-bit-per-channel, 4-channel interleaved buffer with the specified scalar value. [`func vImageOverwriteChannelsWithScalar_ARGBFFFF(Pixel_F, UnsafePointer, UnsafePointer, UInt8, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageOverwriteChannelsWithScalar_ARGBFFFF(_:_:_:_:_:)) Overwrites the selected channels of a 32-bit-per-channel, 4-channel interleaved buffer with the specified scalar value. --- 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)