Create the vertical uprights for the backdrop stand using two 2-by-2-inch strips of wood. Lay them parallel to each other on the ground or floor.
Measure and mark the width of the roll of photography backdrop paper on each 1-by-3-inch strip of wood. Subtract the width of two 2-by-2-inch strips. By doing so, the frame will end up being precisely as wide as the roll of backdrop paper. Saw the two 1-by-3 strips to identical lengths.
Lay the 1-by-3s between the two 2-by-2s, perpendicular to them. Set them 5 inches in from each end of the 2-by-2 vertical rails. Set flat T-brackets at every corner where the strips of wood meet. Check the corners with a square to make sure they form a square before permanently screwing the T-brackets in place.
Raise the finished frame up, and lean it at a slight angle against the wall in the photography studio. Unroll the backdrop, and clamp the top edge to the top cross piece using a series of binder clips.