在iOS中使用Swift导出16位图像

问题描述

我想导出一个16位图像，并为其保存以下代码

let bv = malloc(width * height * 4)!
var db = vImage_Buffer(data: bv,height: vImagePixelCount(height),width: vImagePixelCount(width),rowBytes: width*2)
//        vImageConvert_PlanarftoPlanar8(&sourceBuffer,&destBuffer,1.0,0.0,vImage_Flags(kvImageNoFlags))
vImageConvert_PlanarftoPlanar16F(&sourceBuffer,&db,vImage_Flags(kvImageNoFlags))
let bp = bv.assumingMemoryBound(to: UInt8.self)
let p = CGDataProvider(data: CFDataCreateWithBytesNocopy(kcfAllocatorDefault,bp,width * height,kcfAllocatorDefault))!

let cgImage = CGImage(width: width,height: height,bitsPerComponent: 5,bitsPerPixel: 16,bytesPerRow: width,space: CGColorSpace(name: CGColorSpace.linearSRGB)!,bitmapInfo: CGBitmapInfo(rawValue: CGImageAlphaInfo.noneskipFirst.rawValue),provider: p,decode: nil,shouldInterpolate: false,intent: .defaultIntent)!

let savePath = self.documentsPath.appendingPathComponent("camera")
let sURL = savePath.appendingPathComponent(String(format: "image.png")
if let imageDestination = CGImageDestinationCreateWithURL(smoothedSceneDepthURL as CFURL,kUTTypePNG,1,nil) {
    CGImageDestinationAddImage(imageDestination,cgImage,nil)
    CGImageDestinationFinalize(imageDestination)
}

Apple文档说，bitsPerComponent和bitsPerPixel的这些值对于iOS here是正确的

但是出现以下错误： [UnkNown process name] CGImageCreate: invalid image bits/pixel or bytes/row.

我能够导出8位灰度图像，并且可以根据需要发布参数

解决方法

如果每个像素16位，则每行将有2*width个字节：

                  bytesPerRow: 2 * width,