我有一个从CIImage加载的UIImage:
I have a UIImage which is loaded from a CIImage with:
tempImage = [UIImage imageWithCIImage:ciImage];
问题是我需要将 tempImage 裁剪为特定的 CGRect ,我知道如何做到这一点的唯一方法是使用 CGImage 。 问题是在iOS 6.0文档中我发现了这个:
The problem is I need to crop tempImage to a specific CGRect and the only way I know how to do this is by using CGImage. The problem is that in the iOS 6.0 documentation I found this:
CGImage 如果使用CIImage对象初始化UIImage对象,则该属性的值为NULL。
A。如何转换CIImage至CGImage? 我正在使用此代码,但我有内存泄漏(并且无法理解在哪里):
A. How to convert from CIImage to CGImage? I'm using this code but I have a memory leak (and can't understand where):
+(UIImage*)UIImageFromCIImage:(CIImage*)ciImage { CGSize size = ciImage.extent.size; UIGraphicsBeginImageContext(size); CGRect rect; rect.origin = CGPointZero; rect.size = size; UIImage *remImage = [UIImage imageWithCIImage:ciImage]; [remImage drawInRect:rect]; UIImage *result = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); remImage = nil; ciImage = nil; // return result; }推荐答案
查看 CIContext createCGImage:fromRect:
CGImageRef img = [myContext createCGImage:ciImage fromRect:[ciImage extent]];从回答类似问题: stackoverflow/a/10472842/474896
此外,因为你有 CIImage 首先,您可以使用 CIFilter 来实际裁剪图像。
Also since you have a CIImage to begin with, you could use CIFilter to actually crop your image.
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