Article: There are two main types of canvas: the thin type and the thick type. The thin canvases are a simple, light-weight board, ideal for framing. The thicker canvases are a sheet of canvas stretched over a wooden frame. They are ideal if you want to extend your design over the edges. If you are going to glue a picture or photo onto the canvas, choose something that is the same size as your image—or a little bit smaller. It is easier to trim an image down to fit a canvas than the other way around. If you are going to create a collage, however, you can choose any size of canvas you want. This is only necessary if you will be creating a collage on it. If you are going to adhere an image onto a thick, wood-frame canvas, you do not need to paint the front, but you should paint the edges. Acrylic paint will work the best for this, because it dries the fastest. Avoid using oil paint or watercolor paint; oil paint will take too long to cure and watercolor paint won't stick.  Choose a color that contrasts your images for a collage. Choose a color that matches or complements a single image that will cover the entire canvas. Sealers come in many different finishes, so you should pick one that you like the best. If you did not paint the canvas, you can skip this step. Use a paper slicer or a craft blade and a metal ruler to do this. Make sure that the edges are nice and neat. If you are going to cover the entire canvas with your image, you will need to trim the image down to fit the canvas. If you are making a collage, trim down the images to different sizes; this will make things look more interesting than if they were all one size. Trace the canvas onto the back of your image, then use a sharp blade and a metal ruler to cut the paper.
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Choose a type of canvas. Choose a size for your project. Paint your canvas a background color, if desired. Allow the paint to dry, then apply a coat of sealant over it. Trim the paper down, if needed.