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Glossary 59
PAL— Phase Alternating Line. A European broadcast standard for video and
broadcasting, with a video format of 625 lines at 25 frames per second.
Reverse Image— Feature that allows you to flip the image horizontally. When
used in a normal forward projection environment, text, graphics, etc, are
backwards. Reverse image is used for rear projection.
RGB— Red, Green, Blue— typically used to describe a monitor that requires
separate signals for each of the three colors.
S-Video—A video transmission standard that uses a 4-pin mini-DIN connector to
send video information along two signal wires called luminance (brightness, Y)
and chrominance (color, C). S-Video is also referred to as Y/C.
SECAM— A French and international broadcast standard for video and
broadcasting, closely related to PAL but with a different method of sending color
information.
SVGA— Super Video Graphics Array,— 800 x 600 pixels count.
SXGA— Super Extended Graphics Array,—1280 x 1024 pixels count.
UXGA— Ultra Extended Graphics Array,—1600 x 1200 pixels count.
VGA— Video Graphics Array—640 x 480 pixels count.
WUXGA— Widescreen Ultra Extended Graphics Array,—1920 x 1200 pixels
count.
XGA— Extended Graphics Array— 1024 x 768 pixels count.
Zoom Lens— Lens with a variable focal length that allows the operator to move
the view in or out thereby making the image smaller or larger.
Zoom Lens Ratio— Is the ratio between the smallest and largest image that a lens
can project from a fixed distance. For example, a 1.4:1 zoom lens ratio means that
a 10 foot image without zoom would be a 14 foot image with full zoom.