# vImageHistogramCalculation_Planar8(_:_:_:) Calculates the histogram of an 8-bit planar buffer. ``` func vImageHistogramCalculation_Planar8(_ src: UnsafePointer, _ histogram: UnsafeMutablePointer, _ flags: vImage_Flags) -> vImage_Error ``` ## Parameters `src` The source vImage buffer. `histogram` The collection that contains 256 elements that receives the histogram data. `flags` The options to use when performing the operation. If your code implements its own tiling or its own multithreading, pass [`kvImageDoNotTile`](/documentation/Accelerate/kvImageDoNotTile); otherwise, pass [`kvImageNoFlags`](/documentation/Accelerate/kvImageNoFlags). ## Return Value [`kvImageNoError`](/documentation/Accelerate/kvImageNoError); otherwise, one of the error codes in . ## Discussion The following code populates the `histogram` array with the histogram of the specified [`vImage_Buffer`](/documentation/Accelerate/vImage_Buffer) structure. ```swift var histogram = [vImagePixelCount](repeating: 0, count: 256) // `buffer` is a `vImage_Buffer` structure. _ = vImageHistogramCalculation_Planar8(&buffer, &histogram, vImage_Flags(kvImageNoFlags)) ``` ## See Also --- 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)