The photo canvas app is a very simple app which allows you to take pictures with your iPhone and send them to this company to be printed on high quality canvas and shipped to you. With the newer iPhone 4 and 4s the camera is able to take high resolution pictures and since people have their phone with them all the time, this is how many people are taking most of their pictures. Unfortunately that used to mean that it was difficult to move the pictures over to your computer, edit them and have them printed professionally.