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What is Image Aspect Ratio and how is it calculated?
An image ratio of its width to its height is referred as an image Aspect Ratio. The Aspect Ratio are often written out as two numbers separated by a colon, for example, 1:1 or 4:3.
The aspect ratio of an image is the ratio of its width to its height. It is commonly expressed as two numbers separated by a colon, as in 16:9. For an x:y aspect ratio, the image is x units wide and y units high. Widely used aspect ratios include 1.85:1 and 2.39:1 in film photography, 4:3 and 16:9 in television, and 3:2 in still camera photography.
This text is copied from Wikipedia/Aspect_ratio_(image)
Examples of Image Aspect Ratios
1 : 1
If an image dimensions are, 350 pixels width and 350 pixels height, than the Image Aspect Ratio are 1:1 (Square).
2 : 1
If an image dimensions are, 1200 pixels width and 600 pixels height, than the Image Aspect Ratio are 2:1.
4 : 3
If an image dimensions are, 1600 pixels width and 1200 pixels height, than the Image Aspect Ratio are 1.33:1 or 4:3.
Let's turn the Aspect Ratio into a even more human friendly examples
The movies that are being seen on the cinemas have an aspect ratio of 16:9. Therefore the width of the screen in the cinema are nearly 56.25% longer than the height. For example, if the cinema screen is 30 meter wide then the height is about 13.2 meter and a movie with the aspect ratio of 16:9 are able to fit in the screen dimensions.
Some widely used aspect ratios
Video: 4:3 is the universal video format of the 20th century and 16:9 serves as universal aspect ratio universal for high-definition television and European digital television.
Photography: 4:3, 3:2 and 16:9 is the most common but 5:3, 5:4 and 1:1 is found as well.
Digital Marketing: 9:16, 16:9, 1.9:1 (Landscape) and 1:1 (Square)