Photo Shop, Paint Shop Pro and Corel Photo Paint all will allow you to stretch and re-proportion an image. I'm sure there are lots of other apps, free and reasonably priced, that will also do the same thing. Generally speaking, keep in mind that the pricyer(sp?) the app, the more features it's likely to have that will let you stretch, shrink, re-proportion, adjust color, contrast, etc. of selected local areas of your image.