从CIImage转换后的侧面UIImage [英] UIImage sideway after converting it from CIImage

问题描述

我正在对UIImage应用过滤器，但转换后，它显示为横向。下面是我的代码。

I'm applying filter on UIImage but after conversion, it appear as sideway. Below is my code.

CIImage *ciImage = [[CIImage alloc] initWithImage:self.imgToProcess];

CIFilter *filter = [CIFilter filterWithName:@"CIPhotoEffectChrome"
                                              keysAndValues:kCIInputImageKey, ciImage, nil];
[filter setDefaults];

CIContext *context = [CIContext contextWithOptions:nil];
CIImage *outputImage = [filter outputImage];

CGImageRef cgImage = [context createCGImage:outputImage fromRect:[outputImage extent]];

UIImage *newImage = [[UIImage alloc]initWithCIImage:outputImage];

它可以成功地在newImage和尺寸中渲染，但是图像是横向的。上面的代码中是否有任何地方会引起方向变化？

It renders successfully in newImage, and dimensions, but the image is side way. Is there any place in above code that cause orientation change ?

推荐答案

在应用滤镜之前将图像缩放到正确的方向。

Scale the image to proper orientation before applying filter.

请点击以下链接： https://stackoverflow.com/q/538064/871102

而不是：

CIImage *ciImage = [[CIImage alloc] initWithImage:self.imgToProcess];

写：

UIImage *properOrientedImage = [self scaleAndRotateImage:self.imgToProcess];

CIImage *ciImage = [[CIImage alloc] initWithImage:properOrientedImage.CGImage];

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