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Panel: Properties > Object Data Properties > Safe Areas

Safe areas are guides used to position elements to ensure that the most important parts of the content can be seen across all screens.

Different screens have varying amounts of overscan (especially older TV sets). That means that not all content will be visible to all viewers, since parts of the image surrounding the edges are not shown. To work around this problem TV producers defined two areas where content is guaranteed to be shown: action safe and title safe.

Overscan

Modern LCD/plasma screens with purely digital signals have no overscan, yet safe areas are still considered best practice and may be legally required for broadcast.

In Blender, safe areas can be set from the Camera and Sequencer views.

Red line: Action safe. Green line: Title safe.
(Blender 2.82 Manual より)

The Safe Areas can be customized by their outer margin, which is a percentage scale of the area between the center and the render size. Values are shared between the Video Sequence editor and camera view.

Safe Areas

Title Safe Margins X/Y

Also known as Graphics Safe. Place all important information (graphics or text) inside this area to ensure it can be seen by the majority of viewers.

Action Safe Margins X/Y

Make sure any significant action or characters in the shot are inside this area. This zone also doubles as a sort of “margin” for the screen which can be used to keep elements from piling up against the edges.

ｉTip

Each country sets a legal standard for broadcasting. These include, among other things, specific values for safe areas. Blender defaults for safe areas follow the EBU (European Union) standard. Make sure you are using the correct values when working for broadcast to avoid any trouble.

Center-Cut Safe Areas

Center-cuts are a second set of safe areas to ensure content is seen correctly on screens with a different aspect ratio. Old TV sets receiving 16:9 or 21:9 video will cut off the sides. Position content inside the center-cut areas to make sure the most important elements of your composition can still be visible in these screens.

Blender defaults show a 4:3 (square) ratio inside 16:9 (widescreen).

Cyan line: action center safe. Blue line: title center safe.
(Blender 2.82 Manual より)