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present across the entire screen, in a large portion of the screen, or localized in a very small area.
Raster
Description - Black display (nothing being displayed).
Application - Useful for centering the raster on a CRT. Many monitor applications require that the
displayed image or text fit completely within a bezel that surrounds the CRT. This usually requires that
you first center the blank raster on the face of the CRT, and then center the image within the raster.
Cutoff
Description - The entire active video area is filled with a shade of gray.
Application - Useful for testing chrominence and contrast.
Window
Description - Single white box in the center of active video. The size of the box is one-third the width
and height of the active video area.
Application - Use for brightness control adjustment.
Focus
Description - This image fills the screen with white M characters.
Application - Used for testing focus.
ColorBar
Description - The image has 7 full-height vertical color bars.
Application - Useful for verifying that none of the video channels are bad or connected incorrectly.
GrayBar
Description - The image has 16 full-height vertical graybars. The intensity of the bars iincreases from
left to right. All bars are untined gray at all levels.
Application - Useful for testing brightness control adjustment and brightness uniformity tests.
Pattern Descriptions
