Quantum Data 801GC - Manual (Page 67)

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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 T o c h e c k t h e v i d e o l i n e a r i t y ; i . e . , g r a y s c a l e
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)