Difference between revisions of "Glossary"
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== E ==
Revision as of 20:37, 11 April 2005
Please add the entry alphabetically to the list.
Aspect Ratio - the ratio (proportion) between height and width of an image.
Banding Visible steps in smooth gradients. Early versions of Panorama Tools software could introduce obvious banding, for example during radial luminance correction as discussed by John Houghton. This problem is largely corrected in current versions of the software.
Cylindrical Projection A projection capable of mapping 360 degrees horizontally by roughly 120 degrees vertically with acceptable distortion. See Cylindrical Projection for more information.
Dynamic Range The ratio in brightness of the brightest highlight to the darkest shadow that are accurately captured in a scene.
Entrance Pupil The special point that you have to rotate your camera around, to avoid parallax errors. Commonly referred to as the Nodal Point, which see for more information.
Equirectangular Projection A projection capable of mapping the entire sphere to a rectangle with 2:1 aspect ratio. See Equirectangular Projection for more information.
Nodal Point The special point that you have to rotate your camera around, to avoid parallax. Also called "entrance pupil". Click the term for more info.
Nadir The point directly below
Projections Different possibilities to get a two-dimensional image of the three-dimensional world around us.
Rectilinear Projection A projection in which every straight line in the world stays straight in the image. See Rectilinear Projection for more information.
Vignetting Light fall-off in the corners of images
Zenith The point directly above.