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2. Aspect ratio (image) - Wikipedia

   en.wikipedia.org/wiki/Aspect_ratio_(image)

   Aspect ratio (image) The aspect ratio of an image is the ratio of its width to its height. It is expressed as two numbers separated by a colon, width:height. Common aspect ratios are 1.85:1 and 2.40:1 in cinematography, 4:3 and 16:9 in television, and 3:2 in still photography.

3. Display resolution standards - Wikipedia

   en.wikipedia.org/wiki/Display_resolution_standards

   The 1280 × 1024 resolution is not the standard 4:3 aspect ratio, instead it is a 5:4 aspect ratio (1.25:1 instead of 1. 3:1). A standard 4:3 monitor using this resolution will have rectangular rather than square pixels, meaning that unless the software compensates for this the picture will be distorted, causing circles to appear elliptical.

4. Pixel aspect ratio - Wikipedia

   en.wikipedia.org/wiki/Pixel_aspect_ratio

   The aspect ratio of the pixels themselves is known as the pixel aspect ratio (PAR) – for square pixels this is 1:1 – and these are related by the identity: SAR × PAR = DAR. Rearranging (solving for PAR) yields: PAR = DAR / SAR. For example: A 640 × 480 VGA image has a SAR of 640/480 = 4:3, and if displayed on a 4:3 display (DAR = 4:3) has ...

5. List of aspect ratios of national flags - Wikipedia

   en.wikipedia.org/wiki/List_of_aspect_ratios_of...

   Also the only flag with a decimal ratio below 1 (i.e. taller than it is wide). While the red inner part has a ratio of exactly 4:3 (0.75), [66] the complete flag has an irrational aspect ratio of approximately 1.21901:1 due to the blue border. [Note 3][67] Netherlands. 2:3 (1.5) [68] Compare to the flag of Luxembourg.

6. Chroma subsampling - Wikipedia

   en.wikipedia.org/wiki/Chroma_subsampling

   In JPEG, 4:4:2 and 4:2:1 half the vertical resolution of Cb compared to 4:4:4 and 4:4:0. [19] In another version of 4:2:1, Cb horizontal resolution is half that of Cr (and a quarter of the horizontal resolution of Y). 4:1:0.5 or 4:1:0.25 are variants of 4:1:0 with reduced horizontal resolution on Cb, similar to VHS quality.

7. Image resolution - Wikipedia

   en.wikipedia.org/wiki/Image_resolution

   Image resolution. Image resolution is the level of detail of an image. The term applies to digital images, film images, and other types of images. "Higher resolution" means more image detail. Image resolution can be measured in various ways. Resolution quantifies how close lines can be to each other and still be visibly resolved.