UIImage from UIView has too big size

I have small section of code below:

- (UIImage *)imageFromView:(UIView *)myView{
if (UIGraphicsBeginImageContextWithOptions!=NULL)
{
    UIGraphicsBeginImageContextWithOptions(myView.bounds.size,NO,0.0); 
}
else 
{
    UIGraphicsBeginImageContext(myView.bounds.size);
}
[myView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return [[viewImage retain] autorelease];

}

After getting UIImage from this function. I save it into photo library. But the size of image is too big. It's pretty different from original image. Anyone has s开发者_如何学Pythonolution for this. Please help me. Thank you all so much.

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NSLog() the current myView.Bounds.size and also check which statement gets called.
How big is your image and how big should it be?