The aspect ratio of a geometric shape is the ratio of its sizes in different dimensions. For example, the aspect ratio of a rectangle is the ratio of its longer side to its shorter side – the ratio of width to height, when the rectangle is oriented as a "landscape".
Standard-definition television is a television system which uses a resolution that is not considered to be either high or enhanced definition. SDTV and high-definition television (HDTV) are the two categories of display formats for digital television (DTV) transmissions. "Standard" refers to the fact that it was the prevailing specification for broadcast television in the mid- to late-20th century.
Video is an electronic medium for the recording, copying, playback, broadcasting, and display of moving visual media. Video was first developed for mechanical television systems, which were quickly replaced by cathode ray tube (CRT) systems which were later replaced by flat panel displays of several types.
Computer display standards are a combination of aspect ratio, display size, display resolution, color depth, and refresh rate. They are associated with specific expansion cards, video connectors and monitors.
The BMP file format, also known as bitmap image file or device independent bitmap (DIB) file format or simply a bitmap, is a raster graphics image file format used to store bitmap digital images, independently of the display device, especially on Microsoft Windows and OS/2 operating systems.
On 2D displays, such as computer monitors and TVs, the display size is the physical size of the area where pictures and videos are displayed. The size of a screen is usually described by the length of its diagonal, which is the distance between opposite corners, usually in inches. It is also sometimes called the physical image size to distinguish it from the "logical image size," which describes a screen's display resolution and is measured in pixels.
Anamorphic widescreen is a process by which a comparatively wide widescreen image is horizontally compressed to fit into a storage medium with a narrower aspect ratio, reducing the horizontal resolution of the image while keeping its full original vertical resolution. Compatible play-back equipment can then expand the horizontal dimension to show the original widescreen image. This is typically used to allow one to store widescreen images on a medium that was originally intended for a narrower ratio, while using as much of the frame – and therefore recording as much detail – as possible.
16:9 (1.78:1) is a widescreen aspect ratio with a width of 16 units and height of 9.
The display resolution or display modes of a digital television, computer monitor or display device is the number of distinct pixels in each dimension that can be displayed. It can be an ambiguous term especially as the displayed resolution is controlled by different factors in cathode ray tube (CRT) displays, flat-panel displays and projection displays using fixed picture-element (pixel) arrays.
In digital photography, the crop factor, format factor, or focal length multiplier of an image sensor format is the ratio of the dimensions of a camera's imaging area compared to a reference format; most often, this term is applied to digital cameras, relative to 35 mm film format as a reference. In the case of digital cameras, the imaging device would be a digital sensor. The most commonly used definition of crop factor is the ratio of a 35 mm frame's diagonal (43.3 mm) to the diagonal of the image sensor in question; that is, CF=diag35mm / diagsensor. Given the same 3:2 aspect ratio as 35mm's 36 mm × 24 mm area, this is equivalent to the ratio of heights or ratio of widths; the ratio of sensor areas is the square of the crop factor.
Nominal analog blanking or nominal analogue blanking is the outermost part of the overscan of a standard definition digital television image. It consists of a variable and arbitrary gap of black pixels at the left and right sides, which correspond to the end and start of the horizontal blanking interval: the front porch at the right side, and the back porch at the left side. Digital television ordinarily contains 720 pixels per line, but only about 702 (PAL) to 704 (NTSC) of them contain picture signal. The edge may not be clean — some blurring can occur — and the location is arbitrary, since analogue equipment may typically shift the picture sideways in an unexpected amount or direction. Really old analogue equipment can cause the total width of 'active picture' to vary, usually down, perhaps to as few as 680 pixels.
Pixel aspect ratio is a mathematical ratio that describes how the width of a pixel in a digital image compares to the height of that pixel.
Note: For a quick understanding of numbers like 1/2.3, skip to table of sensor formats and sizes. For a simplified discussion of image sensors see image sensor.
21:9 is a consumer electronics (CE) marketing term to describe the ultra-widescreen (Ultrawide) aspect ratio of 64:27, designed to show films recorded in CinemaScope and equivalent modern anamorphic formats. The main benefit of this screen aspect ratio, compared to the more common 16:9, is the absence of the black bars at the top and bottom of the screen when viewing content in this format, and a constant display height when displaying other content with a lesser aspect ratio.
The graphics display resolution is the width and height dimension of an electronic visual display device, such as a computer monitor, in pixels. Certain combinations of width and height are standardized and typically given a name and an initialism that is descriptive of its dimensions. A higher display resolution in a display of the same size means that displayed photo or video content appears sharper, and pixel art appears smaller.
The aspect ratio of an image describes the proportional relationship between its width and its height. It is commonly expressed as two numbers separated by a colon, as in 16:9. For an x:y aspect ratio, no matter how big or small the image is, if the width is divided into x units of equal length and the height is measured using this same length unit, the height will be measured to be y units.
The study of image formation encompasses the radiometric and geometric processes by which 2D images of 3D objects are formed. In the case of digital images, the image formation process also includes analog to digital conversion and sampling.
A ratio is a relationship between numbers or quantities.
5K resolution refers to display formats with a horizontal resolution of around 5,000 pixels. The most common 5K resolution is 5120 × 2880, which has an aspect ratio of 16:9 with around 14.7 million pixels, with four times the linear resolution of 720p. This resolution is typically used in computer monitors to achieve a higher dpi, and is not a standard format in digital television and digital cinematography, which feature 4K resolutions and 8K resolutions.
The term 16K resolution (8640p), also known as 16K UHD, 16K Ultra HD, 16K Ultra High Definition, Quad Ultra HD, Quad UHD, 16K QUHD, 16K Quad Ultra High Definition, or UHDTV-3 refers to a display resolution that has 15360 horizontal pixels by 8640 vertical pixels, for a total of 132.7 megapixels. It has four times as many pixels as 8K resolution, 16 times as many pixels as 4K resolution and 64 times as many pixels as 1080p resolution.
