图像在裁剪后会模糊吗?

I have an application in which i am cropping the image taken from the camera.all are going well.but after the cropping the image seems to blured and streched.

我有一个应用程序，我正在裁剪从相机拍摄的图像。一切进展顺利。但在剪切之后，图像似乎变红，呈条纹状。

CGRect rect = CGRectMake(20,40,280,200);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();

// translated rectangle for drawing sub image 
CGRect drawRect = CGRectMake(-rect.origin.x, -rect.origin.y,280,200);

// clip to the bounds of the image context
// not strictly necessary as it will get clipped anyway?
CGContextClipToRect(context, CGRectMake(0, 0, rect.size.width, rect.size.height));

// draw image
[image drawInRect:drawRect];

// grab image
UIImage* croppedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGSize size = [croppedImage size];
NSLog(@" = %@",NSStringFromCGSize(size));
NSData* pictureData = UIImagePNGRepresentation(croppedImage);

Can anybody help me in finding out where i am going wrong?

有人能帮我找出我哪里出错了吗?

1 个解决方案

#1

try replacing

尝试更换

UIGraphicsBeginImageContext(rect.size);

with

与

UIGraphicsBeginImageContextWithOptions(rect.size, NO, [[UIScreen mainScreen] scale]);

to account for retina

考虑到视网膜

#1