# Functions that remove an alpha channel from four-channel buffers Remove the alpha channel from an RGBA or ARGB buffer. ## Topics ### Conversion from 8-bit-per-channel, 4-channel interleaved buffers [`func vImageConvert_ARGB8888toRGB888(UnsafePointer, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_ARGB8888toRGB888(_:_:_:)) Removes the alpha channel from an 8-bit-per-channel ARGB buffer to produce an 8-bit-per-channel RGB result. [`func vImageConvert_RGBA8888toRGB888(UnsafePointer, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_RGBA8888toRGB888(_:_:_:)) Removes the alpha channel from an 8-bit-per-channel RGBA buffer to produce an 8-bit-per-channel RGB result. [`func vImageConvert_BGRA8888toRGB888(UnsafePointer, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_BGRA8888toRGB888(_:_:_:)) Removes the alpha channel from an 8-bit-per-channel BGRA buffer to produce an 8-bit-per-channel RGB result. [`#define vImageConvert_BGRA8888toBGR888(_bgraSrc, _bgrDest, _flags)`](/documentation/Accelerate/vImageConvert_BGRA8888toBGR888) Removes the alpha channel from an 8-bit-per-channel BGRA buffer to produce an 8-bit-per-channel BGR result. [`#define vImageConvert_RGBA8888toBGR888(_rgbaSrc, _bgrDest, _flags)`](/documentation/Accelerate/vImageConvert_RGBA8888toBGR888) Removes the alpha channel from an 8-bit-per-channel RGBA buffer to produce an 8-bit-per-channel BGR result. [`func vImageConvert_ARGB8888toRGB565(UnsafePointer, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_ARGB8888toRGB565(_:_:_:)) Removes the alpha channel from an 8-bit-per-channel ARGB buffer to produce an RGB565 result. [`func vImageConvert_ARGB8888toRGB565_dithered(UnsafePointer, UnsafePointer, UnsafeMutableRawPointer!, Int32, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_ARGB8888toRGB565_dithered(_:_:_:_:_:)) Removes the alpha channel from an 8-bit-per-channel ARGB buffer using the specified dithering algorithm to produce an RGB565 result. [`func vImageConvert_BGRA8888toRGB565(UnsafePointer, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_BGRA8888toRGB565(_:_:_:)) Removes the alpha channel from an 8-bit-per-channel RGBA buffer to produce an RGB565 result. [`func vImageConvert_BGRA8888toRGB565_dithered(UnsafePointer, UnsafePointer, UnsafeMutableRawPointer!, Int32, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_BGRA8888toRGB565_dithered(_:_:_:_:_:)) Removes the alpha channel from an 8-bit-per-channel BGRA buffer using the specified dithering algorithm to produce an RGB565 result. [`func vImageConvert_RGBA8888toRGB565_dithered(UnsafePointer, UnsafePointer, UnsafeMutableRawPointer!, Int32, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_RGBA8888toRGB565_dithered(_:_:_:_:_:)) Removes the alpha channel from an 8-bit-per-channel RGBA buffer using the specified dithering algorithm to produce an RGB565 result. [`func vImageConvert_RGBA8888toRGB565(UnsafePointer, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_RGBA8888toRGB565(_:_:_:)) Removes the alpha channel from an 8-bit-per-channel RGBA buffer to produce an RGB565 result. [`func vImageConvert_ARGB8888ToRGB16U(UnsafePointer, UnsafePointer, UnsafePointer, UInt8, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_ARGB8888ToRGB16U(_:_:_:_:_:_:)) Removes the alpha channel from an 8-bit-per-channel ARGB buffer to produce an unsigned 16-bit-per-channel RGB result. ### Conversion from unsigned 16-bit-per-channel, 4-channel interleaved buffers [`func vImageConvert_ARGB16UtoRGB16U(UnsafePointer, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_ARGB16UtoRGB16U(_:_:_:)) Removes the alpha channel from an unsigned 16-bit-per-channel ARGB buffer to produce an unsigned 16-bit-per-channel RGB result. [`func vImageConvert_BGRA16UtoRGB16U(UnsafePointer, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_BGRA16UtoRGB16U(_:_:_:)) Removes the alpha channel from an unsigned 16-bit-per-channel BGRA buffer to produce an unsigned 16-bit-per-channel RGB result. [`func vImageConvert_RGBA16UtoRGB16U(UnsafePointer, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_RGBA16UtoRGB16U(_:_:_:)) Removes the alpha channel from an unsigned 16-bit-per-channel RGBA buffer to produce an unsigned 16-bit-per-channel RGB result. ### Conversion from ARGB1555 16-bit-per-channel, 4-channel interleaved buffers [`func vImageConvert_ARGB1555toRGB565(UnsafePointer, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_ARGB1555toRGB565(_:_:_:)) Removes the alpha channel from an ARGB1555 buffer to produce an RGB565 result. [`func vImageConvert_RGBA5551toRGB565(UnsafePointer, UnsafePointer, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_RGBA5551toRGB565(_:_:_:)) Removes the alpha channel from an RGBA5551 buffer to produce an RGB565 result. ### Conversion from 32-bit-per-channel, 4-channel interleaved buffers [`func vImageConvert_ARGBFFFFtoRGBFFF(UnsafePointer!, UnsafePointer!, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_ARGBFFFFtoRGBFFF(_:_:_:)) Removes the alpha channel from a floating-point 32-bit-per-channel ARGB buffer to produce a floating-point 32-bit-per-channel RGB result. [`func vImageConvert_BGRAFFFFtoRGBFFF(UnsafePointer!, UnsafePointer!, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_BGRAFFFFtoRGBFFF(_:_:_:)) Removes the alpha channel from a floating-point 32-bit-per-channel BGRA buffer to produce a floating-point 32-bit-per-channel RGB result. [`func vImageConvert_RGBAFFFFtoRGBFFF(UnsafePointer!, UnsafePointer!, vImage_Flags) -> vImage_Error`](/documentation/Accelerate/vImageConvert_RGBAFFFFtoRGBFFF(_:_:_:)) Removes the alpha channel from a floating-point 32-bit-per-channel RGBA buffer to produce a floating-point 32-bit-per-channel RGB result. --- 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)