Final answer:
The rectangle in the frame edge marks the boundary of the television screen. It represents the area where the action is displayed and serves as a guide for positioning and framing the content within the screen.
Step-by-step explanation:
The rectangle in the frame edge marks the boundary of the television screen. It represents the area where the action is displayed and serves as a guide for positioning and framing the content within the screen.
For example, when filmmakers use the rule of thirds, they divide the screen into a 9-grid using two horizontal and two vertical lines. The points of intersection mark key areas for placing subjects or objects of interest, ensuring a visually balanced composition.
In the context of television sets, the rectangle helps to indicate the safe zone for action, as certain portions of the screen might be cropped or hidden due to television overscan, which is the tendency for televisions to cut off portions of the displayed image.