BKSTS Illustrated Dictionary of Moving Image Technology, 4th Edition

Appendix B Image areas used in television

Table App.B.1    Film image areas for 4:3 television

Transmitted area (mm)	Safe action area (mm)	Safe title area (mm)	Corner radius (mm)
16 mm film	9.35 × 7.00	8.4 × 6.3	7.5 × 5.6	1.5
35 mm film	20.12 × 15.10	18.1 × 13.6	16.1 × 12.1	3.2
50 × 50 mm slides	28.60 × 21.50	25.7 × 19.3	22.8 × 17.2	4.6

For 4:3 television, the dimensions of the safe action area and safe title area represent 90 per cent and 80 per cent respectively of the transmitted area.

For 16:9 television, the safe action area height is 93 per cent of the picture height and the safe title area is 90 per cent.

Note that the change to display screens with little or no rounded corners means that safe areas are now usually ...