When i am using UIImagePNGRepresentation or UIImageJPEGRepresentation for converting UIImage into NSdata, the image size is too much increased.

Steps to Reproduce:

1)Open Xcode and select new project as single view based application

2)Open ViewController.xib and add two buttons named as i)Test Online Image ii)Test Local image

3)Add two IBActions 

  i)  -(IBAction)ClickLocalImageTest:(id)sender;

  ii) -(IBAction)ClickOnLineImageTest:(id)sender;

4)Connect "Test Online Image" to "-(IBAction)ClickOnLineImageTest:(id)sender"

and "Test Local image" to " -(IBAction)ClickLocalImageTest:(id)sender;"

5)impalement "-(IBAction)ClickLocalImageTest:(id)sender" method like as following 

- (IBAction)ClickLocalImageTest:(id)sender {
    NSLog(@"*************Test Local Image****************\n");
    NSString *path=[[NSBundle mainBundle] pathForResource:@"hero_ipad_retina" ofType:@"jpg"];
    NSLog(@"Before testing image size is :<---- %u kb",[[NSData dataWithContentsOfFile:path] length]/1024);
    UIImage *img  = [UIImage imageNamed:@"hero_ipad_retina.jpg"];
     NSLog(@"UIImagePNGRepresentation: image size is---->: %u kb",[UIImagePNGRepresentation(img) length]/1024);
    NSLog(@"UIImageJPEGRepresentation with scale 1.0: image size is---->: %u kb \n",[UIImageJPEGRepresentation(img, 1.0) length]/1024);
    NSLog(@"*************Completed test****************\n\n\n\n");
}

6) impalement "- (IBAction)ClickOnLineImageTest:(id)sender" method as following 

- (IBAction)ClickOnLineImageTest:(id)sender {
     NSLog(@"*************Test Online Image****************\n");
NSLog(@"Before testing image size is :<---- %u kb",[[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://images.apple.com/home/images/hero_ipad_retina.jpg"]] length]/1024);
UIImage *img  = [UIImage imageWi
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