iOS8可以使用CIFilter来动态改变UIImage的色调/饱和度/亮度吗？

Question

iOS8可以使用CIFilter来动态改变UIImage的色调/饱和度/亮度吗？

3

我正在查看一个使用核心图像滤镜调整色相/饱和度/亮度的苹果示例。在这种情况下，输入图像的属性被调整，并且由于过滤操作而返回另一张图像作为结果。我想知道这个转换是否可以进行动画处理（逐步转换）。 有没有办法通过编程使黑白图像缓慢褪色并逐渐变成彩色？ 我查看了Apple视图编程指南，但没有看到任何关于动画图像或颜色的内容。

- (void)hueChanged:(id)sender
{
    CGFloat hue = [hueSlider value];
    CGFloat saturation = [saturationSlider value];
    CGFloat brightness = [brightnessSlider value];

    // Update labels

    [hueLabel setText:[NSString stringWithFormat:NSLocalizedString(@"Hue: %f", @"Hue label format."), hue]];
    [saturationLabel setText:[NSString stringWithFormat:NSLocalizedString(@"Saturation: %f", 

    @"Saturation label format."), saturation]];
        [brightnessLabel setText:[NSString stringWithFormat:NSLocalizedString(@"Brightness: %f", @"Brightness label format."), brightness]];

        // Apply effects to image


        dispatch_async(processingQueue, ^{
            if (!self.colorControlsFilter) {
                self.colorControlsFilter = [CIFilter filterWithName:@"CIColorControls"];
            }
            [self.colorControlsFilter setValue:self.baseCIImage forKey:kCIInputImageKey];
            [self.colorControlsFilter setValue:@(saturation) forKey:@"inputSaturation"];
            [self.colorControlsFilter setValue:@(brightness) forKey:@"inputBrightness"];

            CIImage *coreImageOutputImage = [self.colorControlsFilter valueForKey:kCIOutputImageKey];

            if (!self.hueAdjustFilter) {
                self.hueAdjustFilter = [CIFilter filterWithName:@"CIHueAdjust"];
            }
            [self.hueAdjustFilter setValue:coreImageOutputImage forKey:kCIInputImageKey];
            [self.hueAdjustFilter setValue:@(hue) forKey:@"inputAngle"];

            coreImageOutputImage = [self.hueAdjustFilter valueForKey:kCIOutputImageKey];

            CGRect rect = CGRectMake(0,0,self.image.size.width,self.image.size.height);
            CGImageRef cgImage = [self.context createCGImage:coreImageOutputImage fromRect:rect];
            UIImage *image = [UIImage imageWithCGImage:cgImage];
            CGImageRelease(cgImage);

            dispatch_async(dispatch_get_main_queue(), ^{
                [imageView setImage:image];
            });
        });

    //    imageView.center = self.view.center;
    //    imageView.frame = self.view.frame;

    }

- Alex Stone

你最终解决了吗？我也对这个感兴趣。 - Teddy

1个回答

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- Harsh Thakur · Answer 1

如果需要缓慢淡出的动画效果，您可以在IOS中使用核心动画。

theView.alpha = 0;
[UIView animateWithDuration:1.0
             animations:^{

                  //Apply effects to image here

                 theView.center = midCenter;
                 theView.alpha = 1;


             }
             completion:^(BOOL finished){
                 [UIView animateWithDuration:1.0
                                  animations:^{
                                      //Apply effects to image here
                                  }
                                  completion:^(BOOL finished){

                                  }];
             }];