Gaussian Blur a UIImageView (iOS)
2 answers
You can use StackBluriOS or GPUImage
or
Try it (found here ): Answer from fooobar.com/questions/638114 / ...
@interface UIImage (ImageBlur)
- (UIImage *)imageWithGaussianBlur;
@end
@implementation UIImage (ImageBlur)
- (UIImage *)imageWithGaussianBlur {
float weight[5] = {0.2270270270, 0.1945945946, 0.1216216216, 0.0540540541, 0.0162162162};
// Blur horizontally
UIGraphicsBeginImageContext(self.size);
[self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height) blendMode:kCGBlendModePlusLighter alpha:weight[0]];
for (int x = 1; x < 5; ++x) {
[self drawInRect:CGRectMake(x, 0, self.size.width, self.size.height) blendMode:kCGBlendModePlusLighter alpha:weight[x]];
[self drawInRect:CGRectMake(-x, 0, self.size.width, self.size.height) blendMode:kCGBlendModePlusLighter alpha:weight[x]];
}
UIImage *horizBlurredImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// Blur vertically
UIGraphicsBeginImageContext(self.size);
[horizBlurredImage drawInRect:CGRectMake(0, 0, self.size.width, self.size.height) blendMode:kCGBlendModePlusLighter alpha:weight[0]];
for (int y = 1; y < 5; ++y) {
[horizBlurredImage drawInRect:CGRectMake(0, y, self.size.width, self.size.height) blendMode:kCGBlendModePlusLighter alpha:weight[y]];
[horizBlurredImage drawInRect:CGRectMake(0, -y, self.size.width, self.size.height) blendMode:kCGBlendModePlusLighter alpha:weight[y]];
}
UIImage *blurredImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//
return blurredImage;
}
And use it like this:
UIImage *blurredImage = [originalImage imageWithGaussianBlur];
To get a stronger blur, just apply this effect twice or more :)
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You need to use Framework CoreImage ( Apple Doc ) or any third party frameworks like GPUImage ( Github page ). Gaussian Blur is only available in CoreImage (iOS) starting with iOS 6. Of course, you can use any other solution, but the correct "filtering" is done with these frameworks.
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