Gallery wrap is a method of stretching an artist's canvas so that the canvas wraps around the sides of the stretcher bar and is secured to the back of the wooden frame. The frame is usually 1.25" (approx. 4 cm) thick. As a result, the hardware (staples ) used to secure the canvas are not visible. The sides of the canvas are prepared and primed in the same manner as the face or front. This method of stretching and preparing a canvas allows for a frameless presentation of the finished painting or photograph. In some competitions it is considered "framed" and ready to hang.
From Wikipedia
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