Monoprice 9497 Disney World of Wonder - Manual (Page 24)

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This test chart (figure 54) consists of a fine grain black and white
checkered background, which should appear flat grey from a
distance. Our eyes will average the black and white elements
together to approximate 50% grey. If you are using a digitally
connected flat panel display, this chart will only work well if the
display presents a pixel accurate 1920x1080 image without
overscan. Disable the overscan setting on your monitor if possible
or the results are likely to be invalid.
The vertical bars are 50% grey with varying degrees of gamma
compensation. The darkest vertical bar is 50% grey with no gamma
compensation, marked “1.0.” The vertical bars appear incrementally
brighter across the chart as the gamma compensation number
increases. While standing back from the display, notice which
vertical bar seems to blend best into the checkered background.
The standard gamma target is “2.2.” If your monitor has gamma
settings, it should be left in the “normal” position for the most
accurate image reproduction. clip points
The Grayscale test pattern (figure 55) may take many forms but the
elements are always examples of full black, full white and shades
of grey in between. This pattern will run the Red, Green and Blue
channels of the display system through the entire available bright-
ness range. A truly accurate rendition of the test pattern will not
contain color shifts at any point. A color shift indicates one or more
of the color channels’ failure to track the grayscale properly.
If a monitor presents color shifts along the path of the grayscale,
it will require qualified service personnel with specialized instru-
ments to repair the issue. Do not attempt to open the monitor and
perform these adjustments yourself. service
adjustMents
GRaYsCaLE
Both the continuous grayscale and the 10 step grayscale present
ideal black, ideal white and shades of grey in between. The
continuous grayscale strips on the top and bottom are bisected
by a special grayscale, labeled the “High Scale Ramp,” (figure 56)
which exceeds the contrast performance expectation of most
monitors. The extreme ends of the High Scale Ramp are absolute
digital white and black. near the ends of the High Scale Ramp are
reference dots that indicate the points where the ramp is expected
to clip or stop changing brightness. The example on the right shows
the High Scale Ramp continuing to brighten compared to the Ideal
Ramp as it nears the right edge of the pattern. The example on the
left shows the expected High Scale Ramp blending into the Ideal
Ramp as it approaches the end.
If there are questions about
the accuracy of Brightness and
contrast settings, return to
the color Bar pattern to adjust
these parameters. user
adjustMents
(figure 56)
(figure 55)*
advanced | DISPlAY EVAlUATIOn TOOlS
Monitor selection
readinG
GaMMa
*Digital Reference Standard