小编Joe*_*Doe的帖子

我试图在上捕获图像iOS10，将其以原始格式存储，然后再处理。拍摄和保存图像不是问题，但是当我稍后尝试使用CIFIlter（imageData：options :)打开DNG文件时，filter.outputImage为nil。这是我的代码：

拍摄图像：

func capture(_ captureOutput: AVCapturePhotoOutput,
             didFinishProcessingRawPhotoSampleBuffer rawSampleBuffer: CMSampleBuffer?,
             previewPhotoSampleBuffer: CMSampleBuffer?,
             resolvedSettings: AVCaptureResolvedPhotoSettings,
             bracketSettings: AVCaptureBracketedStillImageSettings?,
             error: Error?) {


    if let rawSampleBuffer = rawSampleBuffer,
        let data = AVCapturePhotoOutput.dngPhotoDataRepresentation(forRawSampleBuffer: rawSampleBuffer, previewPhotoSampleBuffer: previewPhotoSampleBuffer) {

        // rawFilePath is a filename in my sandbox
        FileManager.default.createFile(atPath: rawFilePath, contents: data, attributes: nil)

    }

}

该文件已按预期保存，我可以在lightroom中打开它而不会出现问题。

这是再次读取文件的代码：

let imageData = try? Data(contentsOf: URL(fileURLWithPath: rawFilePath))

if imageData == nil {
    return nil
}

let filter = CIFilter(
     imageURL: URL(fileURLWithPath: filename),
     options: [String(kCGImageSourceTypeIdentifierHint): "com.adobe.raw-image"]
)

let ciImage: …