# Aspect ratio: `NTSC SVCD: 1`

### Calculation

• Aspect Ratio (short: A/R) is the width of an image or screen, divided by the height. In landscape orientation, the A/R is > 1, for portrait orientation the A/R is < 1 and for square screens, this is = 1.
• Size = `480` x `480` = `0.23` megapixels
• Aspect ratio = `1`
• Angle of diagonal = 0.785 rad = 45°
• Length of diagonal = 678 pixels

### Letterboxing

How does a 1 image fit on a screen with a different aspect ratio?

Barco Escape Cinema (5.94)

Using 16.8 % of the screen

Pillar box
Cinema 2K scope screen (2.39)

Using 42 % of the screen

Pillar box
Cinema 2K flat screen (1.85)

Using 54.1 % of the screen

Pillar box
Cinema 2K full envelope (1.90)

Using 52.9 % of the screen

Pillar box
Extra Wide TV (21:9)

Using 42.2 % of the screen

Pillar box
SXGA/QSXGA screen (5:4)

Using 80 % of the screen

Pillar box
HD television (16:9)

Using 56.5 % of the screen

Pillar box
SD television (4:3)

Using 75.2 % of the screen

Pillar box
Square screen (1.00)

Using 100% of the screen

Perfect match
Vertical HD screen (0.56)

Using 56 % of the screen

Letter box