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GrayBar
Description The primary version has 16 full-height vertical
graybars. The intensity of the bars is shown below.
The secondary version splits the field into a top
and bottom half. The bars in the bottom half of
the screen are in reverse order.
Test Video color tracking (color monitors)
Purpose To check to see that a color monitor accurately
reproduces colors at all intensities
Method Perform the Brightness Control Adjustment and
Brightness Uniformity tests first.
Changes in brightness from bar to bar should be
uniform. All of the bars should appear as an
untinted gray at all levels.
Test Video Gain Linearity (monochrome monitors)
Purpose To check the video linearity; i.e., grayscale
modulation
Method Perform the Brightness Control Adjustment and
Brightness Uniformity tests first.
Changes in brightness from bar to bar should be
visible and uniform.
Black (0% Gray)
7% Gray
13% Gray
20% Gray
27% Gray
33% Gray
40% Gray
47% Gray
53% Gray
60% Gray
67% Gray
73% Gray
80% Gray
87% Gray
93% Gray
White (100% Gray)