Image manipulation and keeping its size same

Hi
I am working on an iPad application which allow user to redact portion of an image. Currently i have added UIView to my imageView and draw brush path using UIBezierPath and save the image by taking snapshot of my Uiimageview. Everythings working fine except the image size, suppose my image is of 1.5 Mb then after saving an image it reduces to 0.5Mb.
My requirement is that after saving image my image size should not reduce.
if (UIGraphicsBeginImageContextWithOptions != NULL) {
            UIGraphicsBeginImageContextWithOptions(self.imageVw.bounds.size, NO , 0.0);
            [self.imageVw.layer renderInContext:UIGraphicsGetCurrentContext()];
            viewImage = UIGraphicsGetImageFromCurrentImageContext();
            UIGraphicsEndImageContext();
This is what i am using to save an image.
Is there any other way to manipulate image without losing its size. For example reading image pixels and writing and replacing new pixels to it?
Looking for your answer.
Thanks.

Any help would be appreciated...

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Image manipulation and keeping its size same

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