# Aspect ratio: `Red 4K: 1.9`

### 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 = `4096` x `2160` = `8.85` megapixels
• Aspect ratio = `1.9`
• Angle of diagonal = 0.485 rad = 27.8°
• Length of diagonal = 4630 pixels

### Letterboxing

How does a 1.9 image fit on a screen with a different aspect ratio?

Barco Escape Cinema (5.94)

Using 31.9 % of the screen

Pillar box
Cinema 2K scope screen (2.39)

Using 79.4 % of the screen

Pillar box
Cinema 2K flat screen (1.85)

Using 97 % of the screen

Letter box
Cinema 2K full envelope (1.90)

Using 100% of the screen

Perfect match
Extra Wide TV (21:9)

Using 79.7 % of the screen

Pillar box
SXGA/QSXGA screen (5:4)

Using 65 % of the screen

Letter box
HD television (16:9)

Using 93 % of the screen

Letter box
SD television (4:3)

Using 70 % of the screen

Letter box
Square screen (1.00)

Using 52 % of the screen

Letter box
Vertical HD screen (0.56)

Using 29 % of the screen

Letter box