The aspect ratio associated with an image describes the proportional relationship between its width as well as height.

 

With DVD and Blu-ray Disc, television, converting formats of unequal ratios is achieved by enlarging the initial image to fill the receiving format's display area and cutting off any excess picture information (cropping and zooming), by adding horizontal mattes or vertical mattes to support the original format's aspect ratio, by stretching (hence distorting) the picture to fill the receiving format's ratio, or by scaling by different factors both in directions, possibly scaling by a different factor the center possibly at the edges (just as Wide Zoom mode).

 

The commonest aspect ratios used today from the presentation of films in theatres are 1.85:1 and a couple of.39:1.[1] Two common videographic aspect ratios are 4:3 (1.33:1),[a] the universal video format with the 20th century, and 16:9 (1.77:1), universal for high-definition television and European digital television. Other cinema and video aspect ratios exist, but they are used infrequently. In still camera photography, the most typical aspect ratios are 4:3, 3:2, plus much more recently being obtained in consumer cameras 16:9.[2] Other aspect ratios, like 5:3, 5:4, and 1:1 (square format), are widely-used in photography also, specifically in medium format and large format.

Commonly Aspect Ratios:

1.3 = 4:3: Some(only a few) computer monitors (VGA, XGA, etc.), SDTV
1.414 = √2:1: International paper sizes (ISO 216)
1.5 = 3:2: 35 mm film
1.6 = 16:10, widely accepted computer displays
1.618: Golden ratio, close to 16:10 = 8:5: Widescreen computer monitors (WXGA, etc.)
1.6 = 5:3: Super 16 mm, an ordinary frame ratio among many European countries
1.7 = 16:9: HDTV