我正在尝试在iOS 6上使用CoreImage模糊图像,而不会有明显的黑色边框。 苹果文档指出,使用CIAffineClamp滤镜可以实现此目的,但我无法从滤镜中获取输出图像。这是我尝试过的,但不幸的是当我访问[clampFilter outputImage]时,创建了一个空图像。如果我只执行模糊处理,则会产生一张图像,但带有深色内置边框。
CIImage *inputImage = [[CIImage alloc] initWithCGImage:self.CGImage];
CIContext *context = [CIContext contextWithOptions:nil];
CGAffineTransform transform = CGAffineTransformIdentity;
CIFilter *clampFilter = [CIFilter filterWithName:@"CIAffineClamp"];
[clampFilter setValue:inputImage forKey:kCIInputImageKey];
[clampFilter setValue:[NSValue valueWithBytes:&transform objCType:@encode(CGAffineTransform)] forKey:@"inputTransform"];
CIImage *outputImage = [clampFilter outputImage];
CIFilter *blurFilter = [CIFilter filterWithName:@"CIGaussianBlur"
keysAndValues:kCIInputImageKey, outputImage, @"inputRadius", [NSNumber numberWithFloat:radius], nil];
outputImage = [blurFilter outputImage];
CGImageRef cgimg = [context createCGImage:outputImage fromRect:[outputImage extent]];
UIImage *blurredImage = [UIImage imageWithCGImage:cgimg];
CGImageRelease(cgimg);
CGImageRef cgimg = [context createCGImage:outputImage fromRect:inputImage.extent];
- bryguy1300