如何更改UIImage的饱和度？ [英] How can I change the saturation of an UIImage?

问题描述

我有一个UIImage，想要移动它的饱和度约+ 10％。是否有标准方法或函数可以用于此？

I have an UIImage and want to shift it's saturation about +10%. Are there standard methods or functions that can be used for this?

推荐答案

有一个CoreImage过滤器。 CIColorControls
只需将 inputSaturation 设置为< 1.0去饱和或> 1.0以增加饱和度...

There's a CoreImage filter for this. CIColorControls Just set the inputSaturation to < 1.0 to desaturate or > 1.0 to increase saturation...

eg。这是我在 UIImage 类别中添加的用于去饱和图像的方法。

eg. Here's a method I've added in a category on UIImage to desaturate an image.

-(UIImage*) imageDesaturated {
    CIContext *context = [CIContext contextWithOptions:nil];
    CIImage *ciimage = [CIImage imageWithCGImage:self.CGImage];
    CIFilter *filter = [CIFilter filterWithName:@"CIColorControls"];
    [filter setValue:ciimage forKey:kCIInputImageKey];
    [filter setValue:@0.0f forKey:kCIInputSaturationKey];
    CIImage *result = [filter valueForKey:kCIOutputImageKey];
    CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]];
    UIImage *image = [UIImage imageWithCGImage:cgImage];
    CGImageRelease(cgImage);
    return image;
}

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