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The following tests are based on the original SMPTE
quideline:
Test: Visual Chroma Gain Adjustment
Method: In order to perform this test, you must have a way
of turning off the red and green guns in the monitor
under test. Turning off the red and green video
components of the 801GX’s video output will not
work for this test.
This test uses the upper and central color bars. Switch
off the red and green guns on the monitor. This will
produce four blue bars, separated by black bars.
Adjust the chroma gain so that the brightness of
each outer blue bar is uniform over the entire bar.
The gain is correct when the bottom 10% of each
bar is the same brightness as the rest of the bar.
Test: Visual Chroma Phase Adjustment
Method: In order to perform this test, you must have a way
of turning off the red and green guns in the monitor
under test. Turning off the red and green video
components of the 801GX’s video output will not
work for this test.
This test uses the upper and central color bars. Switch
off the red and green guns on the monitor. This will
produce four blue bars, separated by black bars.
Adjust the chroma phase so that the brightness of
each of the two central blue bars is uniform over
the entire bar. The phase is correct when the bottom
10% of each bar is the same brightness as the rest of
the bar.
Test: Visual Black Level Adjustment
Method: This test uses the lower right hand portion of the
image. Reduce the black level until the gray bar
disappears. Slowly increase the black level until the
bar just becomes clearly visible.