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Comparison between an image which hasn't been keystone-corrected (top), and one which has been keystone-corrected (bottom).
The keystone effect is the apparent distortion of an image caused by projecting it onto an angled surface. It is the distortion of the image dimensions, such as making a square look like a trapezoid, the shape of an architectural keystone, hence the name of the feature. In the typical case of a projector sitting on a table, and looking upwards to the screen, the image is larger at the top than on the bottom. Some areas of the screen may not be focused correctly as the projector lens is focused at the average distance only.
In photography, the term is used to describe the apparent leaning of buildings towards the vertical centerline of the photo when shooting upwards, a common effect in architectural photography. Likewise, when taking photos looking down, e.g., from a skyscraper, buildings appear to get broader towards the top. The effect is usually corrected by either using special lenses in tilt–shift photography or in post-processing using modern image editing software.
The keystoneeffect is the apparent distortion of an image caused by projecting it onto an angled surface. It is the distortion of the image dimensions...
A keystone species is a species that has a disproportionately large effect on its natural environment relative to its abundance. The concept was introduced...
Look up keystone in Wiktionary, the free dictionary. Keystone or key-stone may refer to: Keystone (architecture), a central stone or other piece at the...
species is not always considered invasive, as in Europe it has a similar keystoneeffect to European beavers, which have not recolonized the area. The beaver...
together with their exact adjoints and derivatives. Anamorphosis Keystoneeffect, one of the defects often repaired by warping Radar geo-warping Softwarp...
Keystone Collections Group, owned by Kratzenberg & Associates Inc., is a privately held local tax collections company operating primarily out of Irwin...
He criticised the image quality issues caused by the rainbow effect and the keystoneeffect as well as the large size of the projector that made it cumbersome...
to the artist's taste. See 3D projection for details. Anamorphosis Keystoneeffect Image distortion Ray, Sidney F. (2002). "63.6: Rectification printing"...
recorded after the gray wolf, both an apex predator and a keystone species (one with a large effect on its ecosystem), was reintroduced to Yellowstone National...
contain a keystone species, a species that has a large impact on the surrounding environment and that can directly affect the food chain. If a keystone species...
flagship species whose conservation benefits other species: 280 or a keystone species which may be targeted for conservation due to its impact on an...
Gulf Keystone Petroleum Limited is an independent oil and gas exploration and production company that operates in the Kurdistan region of Iraq. It is also...
correction is a specific case known as keystone distortion correction derived from Keystoneeffect. Keystone distortion gets its name from the symmetric...
be £200. In a competitive industry, it is often not recommended to use keystone pricing as a pricing strategy due to its relatively high profit margin...
On August 20, 2018, Tyson announced its intent to acquire food supplier Keystone Foods from Marfrig. Tyson announced it had completed the acquisition on...
term keystone species was coined by Robert Paine in 1969 and is a reference to the keystone architectural feature as the removal of a keystone species...
that there are two keystones that seal the worm: the western keystone has become Daijin, while the location of the eastern keystone is unknown. He warns...
biomass. This keystone species effect forms the basis for the concept of ecological extinction. The potential role of the sea otter as the keystone predator...
in the United States, and revoking permits for the construction of the Keystone XL pipeline. On March 11, the first anniversary of COVID-19 having been...
originally created by accident while Chaplin was working at Mack Sennett's Keystone Studios, when dressing up for the 1914 short film Mabel's Strange Predicament...
open the shellfish that form a significant part of its diet. It is a "keystone species", keeping its prey populations in balance so some do not outcompete...
He was scouted for the film industry and began appearing in 1914 for Keystone Studios. He soon developed the Tramp persona and attracted a large fanbase...
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