How to resize an image in iOS?

Question

hi I want to send an image to a web service. But I want to resize user selected any image into 75 x 75 and send it to web service. How can I resize this image into 75 x 75

Thanks

http://stackoverflow.com/questions/10491080/uiimage-resizing-not-working-properly/10491692#10491692 check this awesome Answer by Rob — pmk, Jun 10 '13 at 07:26

score 41 · Accepted Answer · edited Dec 01 '18 at 16:52

41

Try to implement the code below. It may be helpful for you:

    CGRect rect = CGRectMake(0,0,75,75);
    UIGraphicsBeginImageContext( rect.size );
    [yourCurrentOriginalImage drawInRect:rect];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

edited Dec 01 '18 at 16:52

Bill

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answered Jun 10 '13 at 07:20

Nitin Gohel

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hi thanks for thr rply,, If I send in JPG format, how to change this `UIImagePNGRepresentation` – iDia Jun 10 '13 at 07:26
you can use UIImageJPEGRepresentation , it needs the quality in float. – ilmetu Feb 17 '15 at 13:03
2

Why do did you add the extra step where you create PNG data only to create a new image again? – rckoenes Feb 21 '17 at 13:54
yes you are right but i think at that time he asking me to chagne quolity about i am not remember well but might be for that i added it other wise picture1 is good to go. – Nitin Gohel Feb 21 '17 at 13:58
1

Thanks @NitinGohel for your superb solution. – Jagat Dave May 27 '19 at 06:14

score 33 · Answer 2 · answered Jun 10 '13 at 07:26

Use this method to resize your image:

+(UIImage *)imageResize :(UIImage*)img andResizeTo:(CGSize)newSize
{
    CGFloat scale = [[UIScreen mainScreen]scale];
    /*You can remove the below comment if you dont want to scale the image in retina   device .Dont forget to comment UIGraphicsBeginImageContextWithOptions*/
    //UIGraphicsBeginImageContext(newSize);
    UIGraphicsBeginImageContextWithOptions(newSize, NO, scale);
    [img drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}

score 7 · Answer 3 · answered Jun 10 '13 at 07:25

try this code:

- (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize
{
    UIGraphicsBeginImageContext(newSize);
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();    
    UIGraphicsEndImageContext();
    return newImage;
}

How to resize an image in iOS?

3 Answers3

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