Shrink image without affecting the quality in objective c

Question

How to shrink the image without affecting the quality programmatically.

After capture the image I want to reduce the size of that image without changing the quality in

Answer 1

I search a lot with this topic a lot. After few days, i found this one. Hope this is much faster then the accepted answer.

NSData *imageData;
imageData=[[NSData alloc] initWithData:UIImageJPEGRepresentation((chosenImage), 1.0)];

NSLog(@"[before] image size: %lu--", (unsigned long)[imageData length]);

CGFloat scale= (100*1024)/(CGFloat)[imageData length]; // For 100KB. 


UIImage *small_image=[UIImage imageWithCGImage:chosenImage.CGImage scale:scale orientation:chosenImage.imageOrientation];

imageData = UIImageJPEGRepresentation(small_image, scale*1.00);


NSLog(@"[after] image size: %lu:%f", (unsigned long)[imageData length],scale);

It worked for me great!. Try it once.