Compare two pages on a Mac document camera (Vizo)

Open Present › Tiles, pick a 2-Grid, 4-Grid, or 6-Grid layout, then Import Image or Take Snapshot into a pane.

Present › Tiles puts more than one pane on screen. Use them to compare the live camera with a snapshot or an import. Masks are a separate control.

Choose the panes

Open Present. Choose Tiles (next to Camera and Board).
Pick 2-Grid, 4-Grid, or 6-Grid.
Leave one tile on the live camera. In another tile, choose Import Image or Take Snapshot.

A normal camera works for a live pane. A document camera is steadier and clearer for paper.

Install Vizo from this website.