Start with the wall, not the file. We'll help you settle on a finished size that suits the space it's hanging in — above a sofa, up a stairwell, one of a grouped set — and because every canvas is made to the exact millimetre, you're never forced to crop your image to a preset size.
Then the bar depth. 20mm Fine Edge sits close to the wall — understated, and well suited to smaller prints and grouped displays. 25mm Slim Edge is the classic gallery wrap most people picture when they think of a canvas. 38mm Deep Edge stands proud of the wall with a sculptural presence that suits large statement pieces.
Finally the edge itself — the calculator calls them Mirror Wrap, Colour Edge Wrap and Gallery Wrap. Mirrored reflects the outer band of the image around the sides, so nothing is lost from the front — the safe choice for portraits. A full wrap looks superb on landscapes and abstracts with room to spare at the edges, but it does fold part of the picture around the sides, and we'll tell you plainly if your photo can't afford it.