标签: ciimage

当用户对iOS上内置的Photos.app中的照片进行一些更改(裁剪,消除红眼......等)时,更改不会应用于fullResolutionImage相应的返回ALAssetRepresentation.

但是,更改将应用​​于thumbnail和fullScreenImage返回的ALAssetRepresentation.此外,有关应用更改的信息可以ALAssetRepresentation通过密钥在元数据字典中找到@"AdjustmentXMP".

我想将这些更改应用于fullResolutionImage自己以保持一致性.我发现,在iOS6的+ CIFilter的filterArrayFromSerializedXMP: inputImageExtent:error:可以在此XMP元数据转换成数组CIFilter的:

ALAssetRepresentation *rep; 
NSString *xmpString = rep.metadata[@"AdjustmentXMP"];
NSData *xmpData = [xmpString dataUsingEncoding:NSUTF8StringEncoding];

CIImage *image = [CIImage imageWithCGImage:rep.fullResolutionImage];

NSError *error = nil;
NSArray *filterArray = [CIFilter filterArrayFromSerializedXMP:xmpData 
                                             inputImageExtent:image.extent 
                                                        error:&error];
if (error) {
     NSLog(@"Error during CIFilter creation: %@", [error localizedDescription]);
}

CIContext *context = [CIContext contextWithOptions:nil];

for (CIFilter *filter in filterArray) {
     [filter setValue:image …

I have been searching for an answer to this question in a few hours now, and I just can't figure it out. I want to add a gaussian blur effect to the image when i press the button "Button". The user is the one that is adding the image.

I have created an action for the "Button" based on sources from SO and other places on the web. It will not work. What am I doing wrong? Any code would …

我需要在UIImage上应用黑白滤镜.我有一个视图,其中有一个用户拍摄的照片,但我没有任何关于转换图像颜色的想法.

- (void)viewDidLoad {
    [super viewDidLoad];
    self.navigationItem.title = NSLocalizedString(@"#Paint!", nil);
    imageView.image = image;
}

我怎样才能做到这一点？

我有一个从CIImage加载的UIImage:

tempImage = [UIImage imageWithCIImage:ciImage];

问题是我需要裁剪tempImage到一个特定的CGRect,我知道如何做到这一点的唯一方法是使用CGImage.问题是在iOS 6.0文档中我发现了这个:

CGImage
If the UIImage object was initialized using a CIImage object, the value of the property is NULL.

A.如何从CIImage转换为CGImage？我正在使用此代码,但我有内存泄漏(并且无法理解在哪里):

+(UIImage*)UIImageFromCIImage:(CIImage*)ciImage {  
    CGSize size = ciImage.extent.size;  
    UIGraphicsBeginImageContext(size);  
    CGRect rect;  
    rect.origin = CGPointZero;  
    rect.size   = size;  
    UIImage *remImage = [UIImage imageWithCIImage:ciImage];  
    [remImage drawInRect:rect];  
    UIImage *result = UIGraphicsGetImageFromCurrentImageContext();  
    UIGraphicsEndImageContext();  
    remImage = nil;  
    ciImage = nil;  
    //
    return result;  
}

设置很简单.

• 带有UIImageView的ViewController,已分配图像.
• 点击时UIButton使UIImageView中的图像模糊.

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var bg: UIImageView!

    @IBAction func blur(_ sender: Any) {
        let inputImage = CIImage(cgImage: (bg.image?.cgImage)!)

        let filter = CIFilter(name: "CIGaussianBlur")
        filter?.setValue(inputImage, forKey: "inputImage")
        filter?.setValue(10, forKey: "inputRadius")
        let blurred = filter?.outputImage
        bg.image = UIImage(ciImage: blurred!)
    }
}

单击按钮时,屏幕变为白色.无法弄清楚我做错了什么.谁知道我做错了什么？

我QR Code使用以下代码制作图像表格:

  func createQRFromString(str: String) -> CIImage? {
        let stringData = str.dataUsingEncoding(NSUTF8StringEncoding)

        let filter = CIFilter(name: "CIQRCodeGenerator")

        filter?.setValue(stringData, forKey: "inputMessage")

        filter?.setValue("H", forKey: "inputCorrectionLevel")

        return filter?.outputImage
    }

然后我添加到UIImageView这样:

    if let img = createQRFromString(strQRData) {
        let somImage = UIImage(CIImage: img, scale: 1.0, orientation: UIImageOrientation.Down)
        imgviewQRcode.image = somImage
    }

现在我需要将其保存到文件JPEG或PNG文件中.但是,当我这样做时,我的应用程序崩溃:

    @IBAction func btnSave(sender: AnyObject) {

    //        // Define the specific path, image name
    let documentsDirectoryURL = try! NSFileManager().URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: true)
    // …

我正在通过PhotoKit编辑照片,但我发现这不会保留原始照片的元数据.即使Apple应用Sepia或Chrome过滤器时提供的SamplePhotosApp也会出现这种情况.我的问题是,您如何确保保留所有原始照片元数据？

我已经发现了如何获取原始图像的元数据,并且我能够将该元数据保存到CIImage我创建的最终元数据中,但是在提交编辑时它仍然被删除.我将转换CIImage为a CGImage转换为UIImageto NSData,或者我将其写入磁盘的方式一定存在问题.

asset.requestContentEditingInputWithOptions(options) { (input: PHContentEditingInput!, _) -> Void in
    //Get full image
    let url = input.fullSizeImageURL
    let orientation = self.input.fullSizeImageOrientation
    var inputImage = CIImage(contentsOfURL: url)
    inputImage = inputImage.imageByApplyingOrientation(orientation)

    //do some processing on original photo here and create a CGImage...

    //save the original photo's metadata to a new CIImage:
    let originalMetadata = inputImage.properties()
    let newImage = CIImage(CGImage: editedCGImage, options: [kCIImageProperties: originalMetadata])

    println(newImage.properties()) //correctly prints all metadata!

    //commit changes to disk …

我刚刚开始使用Objective-C,我正在尝试创建一个简单的应用程序,它会显示带有模糊效果的摄像机视图.我让Camera输出与AVFoundation框架一起工作.现在,我正在尝试连接核心图像框架,但不知道如何,Apple文档让我感到困惑,在线搜索指南和教程导致没有结果.在此先感谢您的帮助.

#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface ViewController ()

@property (strong ,nonatomic) CIContext *context;

@end

@implementation ViewController
AVCaptureSession *session;
AVCaptureStillImageOutput *stillImageOutput;

-(CIContext *)context
{
    if(!_context)
    {
        _context = [CIContext contextWithOptions:nil];
    }
    return _context;
}
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

-(void)viewWillAppear:(BOOL)animated{
    session = [[AVCaptureSession alloc] init];
    [session setSessionPreset:AVCaptureSessionPresetPhoto];

    AVCaptureDevice *inputDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    NSError *error;
    AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:inputDevice error:&error];

    if ([session canAddInput:deviceInput]) {
        [session addInput:deviceInput];
    } …

Core Image 让我们为 CIContext 指定颜色空间，如下所示：

let context = CIContext(options: [kCIContextOutputColorSpace: NSNull(),
                        kCIContextWorkingColorSpace: NSNull()])

或者对于 CIImage，如下所示：

let image = CIImage(cvImageBuffer: inputPixelBuffer,
                    options: [kCIImageColorSpace: NSNull()])

这三者有何关系：

• kCIContextOutputColorSpace
• kCIContext工作颜色空间
• kCI图像颜色空间

设置它们各自的优点和缺点是什么？

我正在尝试在Apples原生相机中创建一个模仿人像模式.

问题是,对于深度数据使用CIImage应用模糊效果对于我想向用户显示的实时预览来说太慢了.

我的代码是使命是:

func blur(image: CIImage, mask: CIImage, orientation: UIImageOrientation = .up, blurRadius: CGFloat) -> UIImage? {
    let start = Date()
    let invertedMask = mask.applyingFilter("CIColorInvert")

    let output = image.applyingFilter("CIMaskedVariableBlur", withInputParameters: ["inputMask" : invertedMask,
                                                                                    "inputRadius": blurRadius])

    guard let cgImage = context.createCGImage(output, from: image.extent) else {
        return nil
    }
    let end = Date()
    let elapsed = end.timeIntervalSince1970 - start.timeIntervalSince1970
    print("took \(elapsed) seconds to apply blur")
    return UIImage(cgImage: cgImage, scale: 1.0, orientation: orientation)
}

我想在GPU上应用模糊以获得更好的性能.对于此任务,我在此处找到了Apple提供的此实现

所以在Apple的实现中,我们有这段代码:

/** Applies a Gaussian blur …