使用NSSlider更改NSImage亮度

Question

我正在使用簡單的圖像處理應用程序，這是我更改NSImage亮度的失敗嘗試：

- (IBAction)brightnessSlider:(NSSlider*)sender {

    ViewController *controller = (ViewController*)[NSApplication sharedApplication].keyWindow.contentViewController;
    controller.imageView.image = originalImage;
    CIImage* const beginImage = [self fromNSImageToCIImage:originalImage];
    filter = [CIFilter filterWithName:@"CIColorControls" keysAndValues: kCIInputImageKey, beginImage, kCIInputBrightnessKey, [sender doubleValue], nil];
    self->filteredImage = self->filter.outputImage;
    controller.imageView.image = [self fromCIImageToNSImage:filteredImage];

}

這是fromNSImageToCIImage和fromCIImageToNSImage的實現：

- (NSImage *)fromCIImageToNSImage:(CIImage *)inputImage {
    struct CGImage *cg = [context createCGImage:inputImage fromRect:[inputImage extent]];
    NSImage *finalImage = [[NSImage alloc] initWithCGImage:cg size:NSZeroSize];
    return finalImage;
}

- (CIImage *)fromNSImageToCIImage:(NSImage *)inputImage {
    struct CGImage *cg = [inputImage CGImageForProposedRect: nil context: nil hints: nil];
    CIImage *temp = [[CIImage alloc] initWithCGImage: cg options: nil];
    return temp;
}

這是正確的方法嗎？ 我什至不知道什么是行不通的。 謝謝。

編輯（我重寫了代碼，發件人的值有問題）：

- (IBAction)brightnessSlider:(NSSlider*)sender {
    ViewController *controller = (ViewController*)[NSApplication sharedApplication].keyWindow.contentViewController;
    CIImage* const beginImage = [self fromNSImageToCIImage:controller.imageView.image];
    CIFilter *brightness = [CIFilter filterWithName:@"CIColorControls" keysAndValues: kCIInputImageKey, beginImage, @"inputBrightness", [sender doubleValue], nil];
    CIImage *outputImage = brightness.outputImage;
    struct CGImage* cgimg = [context createCGImage:outputImage fromRect:[outputImage extent]];
    NSImage *newImage = [[NSImage alloc] initWithCGImage:cgimg size:NSZeroSize];
    controller.imageView.image = newImage;
}

使用NSSlider時崩潰-此行： CIFilter *brightness = [CIFilter filterWithName:@"CIColorControls" keysAndValues: kCIInputImageKey, beginImage, @"inputBrightness", [sender doubleValue], nil];

調試器顯示： 線程1：EXC_BAD_ACCESS（代碼= 1，地址= 0x6fbbba08）

Answer 1

將錯誤行更改為此： CIFilter *brightness = [CIFilter filterWithName:@"CIColorControls" keysAndValues: kCIInputImageKey, beginImage, @"inputBrightness", [NSNumber numberWithFloat:[sender floatValue]], nil]; 做好了