56 GlossaryReverse Image — Feature that allows you to flip the image horizontally. Whenused in a normal forward projection environment text, graphics, etc. arebackwards. Reverse image is used for rear projection.RGB — Red, Green, Blue — typically used to describe a monitor that requiresseparate signals for each of the three colors.S-Video — A video transmission standard that uses a 4-pin mini-DIN connectorto send video information on two signal wires called luminance (brightness, Y) andchrominance (color, C). S-Video is also referred to as Y/C.SECAM — A French and international broadcast standard for video andbroadcasting, closely related to PAL but with a different method of sending colorinformation.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.XGA — Extended Video Graphics Array — 1024 x 768 pixels count.Zoom Lens — Lens with a variable focal length that allows operator to move theview in or out making the image smaller or larger.Zoom Lens Ratio — Is the ratio between the smallest and largest image a lens canproject from a fixed distance. For example, a 1.4:1 zoom lens ratio means that a 10foot image without zoom would be a 14 foot image with full zoom.