InFocus Genesis P130 Manual De Instrucciones página 56

Glosario de términos
Term Description
Anamorphic A technique for changing aspect ratios by optically or digitally
stretching or compressing an image to or from a format with a
different native aspect ratio. Movie studios used this technique to put
the first widescreen movies on standard 35mm film and then used an
anamorphic lens to recreate the image in the widescreen format in
which it was originally shot.
Anamorphic An anamorphic lens is a lens that has different optical magnification
Lens along mutually perpendicular radii. This provides the ability to project
a source image of one aspect ratio, such as 4:3, into a different
aspect ratio, such as 16:9, by using different magnifications for the
horizontal and the vertical dimensions of the projected image.
Anamorphic A projector that supports anamorphic projection using an optional
Ready anamorphic lens.
ANSI American National Standards Institute. A private organization that
coordinates and administers various voluntary consensus standards such
as ANSI lumens. The first ANSI standard was for pipe threading in 1919
when it was called the American Engineering Standards Committee.
ANSI Contrast is the ratio between white and black. The larger the contrast
Contrast ratio the greater the ability of a projector to show subtle colour details
and tolerate extraneous room light. There are two methods used by
the projection industry: 1) Full On/Off contrast measures the ratio
of the light output of an all white image (full on) and the light output
of an all black (full off) image. 2) ANSI contrast is measured with a
pattern of 16 alternating black and white rectangles. The average
light output from the white rectangles is divided by the average light
output of the black rectangles to determine the ANSI contrast ratio.
When comparing the contrast ratio of projectors make sure you are
comparing the same type of contrast. Full On/Off contrast will always
be a larger number than ANSI contrast for the same projector.
ANSI Lumens ANSI lumens is a measurement of the overall brightness of a projector.
Because the center of a projected image is brighter than the corners,
ANSI lumens is the most accurate representation of the image
brightness. ANSI lumens are calculated by dividing a square meter
image into 9 equal rectangles, measuring the lux (or brightness) reading
at the center of each rectangle, and averaging these nine points.
Aperture A device that controls amount of light admitted.
Artifacts Flaws and aberrations in a video image that derive from technical
limitations in the capture, encoding/decoding, transmission, and
display of a video signal.
Aspect Ratio The ratio of image width to image height. Standard television is 4:3
or 1.33:1. Panavision or Cinemascope is 2.35:1 with 1.85:1 being
quite common as well. Widescreen displays are 1.78:1 or 16:9.times
the height. For example, if you want an image 40 inches high then
you need a screen that is at least 40 * 1.78 inches wide or 71 inches.
Other relatively common aspect ratios are 3:2, 4:3 and 5:4.
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