Have you seen the work of professional photographers in which they add a signature or a copyright to all their images and wished you could do it too? Well, guess what? Adding your signature to a photo is very simple. Just go through the steps shown below on how to sign your name on a photograph.
This article describes how to stretch a picture without distorting it so as to retain the appearance of the image in its original form. The concept of aspect ratio is explained, and stretching the photo (in both pixel and percentage terms) using re-sampling to retain image quality is explained here.