keystone effect

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• Keystone effect — The Keystone effect is caused by attempting to project an image onto a surface at an angle, as with a projector not quite centered onto the screen it is projecting on. It is a distortion of the image dimensions, making it look like a trapezoid.… …   Wikipedia

• keystone effect — noun : a type of distortion in a television picture whereby a square pattern appears larger at the top than at the bottom …   Useful english dictionary

• Keystone — may refer to:* Keystone (architecture), the piece at the apex of an arch or vault * The Keystone effect, caused by projecting an image onto a surface at an angle, or by photography at an angle * Keystone correction for these types of… …   Wikipedia

• Keystone species — A keystone species is a species that has a disproportionate effect on its environment relative to its abundancecite journal author=Paine, R.T. year=1995 title=A Conversation on Refining the Concept of Keystone Species journal=Conservation Biology …   Wikipedia

• Keystone (cask) — A keystone is a small wooden or plastic fitting used in ale casks. For some years wooden casks have been effectively obsolete, with the majority now being aluminium or stainless steel, and a few sturdy plastic ones beginning to appear.… …   Wikipedia

• keystone species — /ˈkistoʊn spisɪz/ (say keestohn spees1z) noun a species which has a disproportionate effect on an ecosystem in relation to its population size, its removal or decline resulting in significant consequences and possibly the ultimate destruction of… …  

• keystone error — F/A/V the trapezoidal distortion of a square cornered image due to the optical effect of the projection device not being located in its proper position in respect to the screen …   Audio and video glossary

• NAFTA's effect on United States employment — Studies done by Kate Bronfenbrenner at Cornell University showed the adverse effect of plants threatening to move to Mexico and Canada because of NAFTA.[1] The North American Free Trade Agreement s impact on United States employment …   Wikipedia

• Umbrella effect — An umbrella effect is the protection extended by the presence of an umbrella species to other species in the same habitat. The umbrella species is often either a flagship species whose conservation benefits other species [Sherman, 2002, 280.] or… …   Wikipedia

• List of effects — This is a list of names for observable phenonema that contain the word effect, amplified by reference(s) to their respective fields of study. #*3D audio effect (audio effects)A*Accelerator effect (economics) *Accordion effect (physics) (waves)… …   Wikipedia

• Ecology — For other uses, see Ecology (disambiguation). Ecology …   Wikipedia