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| dispatch_async(dispatch_get_global_queue(0, 0), ^{
CIContext *context = [CIContext contextWithOptions:nil];
CIImage *ciImage = [CIImage imageWithCGImage:image.CGImage];
CIFilter *filter = [CIFilter filterWithName:@"CIGaussianBlur"];
[filter setValue:ciImage forKey:kCIInputImageKey];
[filter setValue:@30.0f forKey: @"inputRadius"];
CIImage *result = [filter valueForKey:kCIOutputImageKey];
CGRect frame = [ciImage extent];
NSLog(@"%f,%f,%f,%f",frame.origin.x,frame.origin.y,frame.size.width,frame.size.height);
CGImageRef outImage = [context createCGImage: result fromRect:ciImage.extent];
UIImage * blurImage = [UIImage imageWithCGImage:outImage];
dispatch_async(dispatch_get_main_queue(), ^{
coreImgv.image = blurImage;
});
});
|
http://www.jianshu.com/p/341a06dd0b46
