Pick image and crop image became low quality iOS

Question

I can pick the image from gallery and then crop the image but it becomes too low quality.

CGRect value=  AVMakeRectWithAspectRatioInsideRect(imageView.image.size, imageView.frame);
UIGraphicsBeginImageContext(imageView.image.size);
[imageView.image drawInRect:CGRectMake(0,0, value.size.width, value.size.height)];
UIImage *img= UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Please any one help me figure out this issue.

Check this http://stackoverflow.com/questions/158914/cropping-an-uiimage — kb920, Jun 02 '16 at 04:24

score 0 · Answer 1 · answered Jun 02 '16 at 04:10

0

You need to create your context with UIGraphicsBeginImageContextWithOptions, and pass In a scale of 0. The call UIGraphicsBeginImageContext does not allow for retina images.

answered Jun 02 '16 at 04:10

Duncan C

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score 0 · Answer 2 · edited Jun 02 '16 at 05:32

Here is what I am doing in my one project:

   //*************** This one creates blury image so used contextWith options *****************************//

   // UIGraphicsBeginImageContext(CGSizeMake(signView.bounds.size.width, signView.bounds.size.height));

    UIGraphicsBeginImageContextWithOptions(signView.bounds.size, signView.opaque, 0.0);

    [signView.layer renderInContext: UIGraphicsGetCurrentContext()];
    // UIImage *imgMySignature = UIGraphicsGetImageFromCurrentImageContext();
    signView.img = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

Here I am rendering image from UIView. signView is object of UIView.

Main concern is, use UIGraphicsBeginImageContextWithOptions instead of UIGraphicsBeginImageContext.

Pick image and crop image became low quality iOS

2 Answers2