DIY Photo transfer onto canvas. Photo-pump up color saturation using an image-editing program. Print image on an overhead transparency. Cover the surface of your canvas with a thin coat of gel medium.Place the transparency ink-side down onto the gel medium and smooth out any air bubbles. Burnish it with the back of a spoon/bone folder, rub vigorously or flip the canvas over & rub from the underside. Lift corner to see if image transferred. Once it does, peel off the film completely.