I was just experimenting with digital editing to change the shape of a photo of my painting that I did not get straight. It wasn't hard to do in PhotoShop so I thought I would share the process with you.

Here is the original:



Here is the transformed one:



The first thing you have to do is create a duplicate layer of the picture. Then click on the original layer and click on the "eye" to make that layer invisible in the work space. Expand the work space so there is a wide border around the picture.

Select the copy layer and then go to "Edit" and scroll down to "Free Transform" or (Control+T) and select it.



A box appears around the picture with small squares at the corners and sides. If you move your mouse outside the box, you will see curved arrows. Hold the right mouse button on the appropriate arrow and rotate the picture to initially straighten it.

Next move inside the box along the side and hold the right mouse button over a double arrow where you want to stretch to area. The results will be a painting with four corner.

You can re-size the overall picture by using holding the right mouse button over any of the squares on the corners or sides of the box.

Once you are satisfied, delete the original layer and save the file under a new name if you don't want to write over the original photo.