WV-31 Color Bar Pattern
This is a standard color bar pattern, with the colors reversed at the bottom. The colors are all the combinations of the primary colors: white (red plus green plus blue), red, green, blue, yellow (red plus green), cyan (green plus blue), magenta (red plus blue), and black (none). The order of the bars
on top is in
descending apparent brightness as seen by the human eye.
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WV-32 Stairstep with Ramp Pattern
This is a standard gray stairstep pattern, with a smooth ramp. The entire pattern should be "gray", with no apparent color to any of the steps. The ramp section should not appear to have steps in it. To check for left-right symmetry, the pattern is reversed at the bottom.
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WV-33 Gamma Tracking, 3:2 Steps
This pattern consists of gray wedges for which the brightness of adjacent sections is encoded in a 3:2 brightness ratio using the standard gamma of 2.2. Thus each section should appear about 2/3 its brighter neighbor, and 3/2 of its dimmer neighbor. Since the originally intended CRT display has a gamma of 2.5, with a compliant display the ratios will measure a little higher than 3:2.
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WV-34 Gamma Tracking, Low Level, 4:3 Steps
This low level gamma tracking pattern has a ratio of 4:3 between adjacent steps, but only covers the dimmer brightness ranges. This can be used to check how a display handles dimmer scenes. All wedges should be viewable, colorless, and have about the same relative level differences from its neighbors. This is a good check for image washout with "bulb" type projectors, and demonstrates how the full field contrast ratio specification is important.
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WV-35 Level Difference Pattern
This pattern has an 85% white background with embedded rectangles that are at slightly different levels. These rectangles are 1%, 2%, 3%, 4% and 5% dimmer (left side) and brighter (right side). The "Y" rectangles are a pure luminance
(black and white)differences, and the "B", "R" and "G" rectangles are Blue, Red and Green only differences. What is the smallest level that can you see? The average human eye can just make out the 1% differences.
With LCD direct view displays, you might find big differences as you view from
different directions.
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WV-36 ANSI Lumen Measurement Pattern
This pattern can be used to approximately measure and calculate ANSI lumens. Project this pattern to full screen, set Brightness and Contrast so the dark (5% & 10%, and very difficult to see) and light (90% & 95%)
gauges are visible, then measure the luminance ("brightness") in all nine boxes. For lumen rating, calculate the average
luminance (Foot Lamberts), multiply by screen area (square feet), then divide by screen gain.
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WV-37 4x4 Checkerboard Pattern
This is a standard pattern for checking contrast, and can be used to determine the ANSI Contrast Ratio. Simply measure the brightness at the center of all the white squares and then at the center of all the black squares. Take the average of the "white" readings and divide by the average of the "black" readings - that's the ANSI contrast ratio.
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WV-38 15% Window Pattern
This pattern can be used to check for peak brightness from CRT and plasma displays which use some sort of "brightness limiting". This limiting causes reduced levels when much of the screen is illuminated, so the lower duty cycle of this pattern permits full, or nearly full, brightness to be possible. The small black/white/gray lines can be used to check for blooming in CRT displays.
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WV-39 256 Level Horizontal Gray Ramp
Each block of this pattern consists of all gray levels from 0 to 255, which corresponds to 24 bit color (8 bits each for red, green, blue). Each small bar
at the top and bottom edges marks the four pixel wide column for each particular level. The pattern should display as a smoothly increasing brightness ramp without any coloration.
Note that image scaling to fill the screen may create some spurious vertical
lines. |
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WV-40 256 Level Vertical Gray Ramp
Each block of this pattern consists of all gray levels from 0 to 255, which corresponds to 24 bit color (8 bits each for red, green, blue). Each small bar marks the six pixel tall row for each particular level. The pattern should display as a smoothly increasing brightness ramp without any coloration.
Note that image scaling to fill the screen may create some spurious horizontal
lines. |
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WV-41 64 Lowest Level Vertical Gray Steps
The blocks of this pattern consists of all gray levels from 0 to 63, which corresponds to the lowest 64 of 256 levels in 24 bit color (8 bits each for red, green, blue). These low steps should be color-free, but you
likely will be able to make out the differences in levels, particularly for the lowest steps.
This demonstrates how 24 bit color (256 gray steps) is insufficient to fully
prevent contouring/gradations. |
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WV-42 90% Step Diff Vertical Gray Steps
Each block of this pattern is 90% of its brighter neighbor. The peak level is full white, and the minimum level is about 1/500th of peak white, assuming a properly setup display with a gamma of 2.5. The apparent brightness difference for each of these steps should
subjectively appear to be approximately the same, and all steps should appear gray (color-free). |
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WV-43 Gamma Bow, 90% Steps
This pattern is consists of 50 gray steps starting at 100%, with each adjacent
step being 90% of its brighter neighbor. The peak level is full white, and the minimum level is about 1/175th of peak white, assuming a properly setup display with a gamma of 2.2. The apparent brightness difference for each of these steps should
subjectively appear to be approximately the same, and all steps should appear gray (color-free). |
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WV-44 Gamma
16-235, .6x Steps
This
gamma tracking pattern consists of gray wedges for which the brightness of adjacent sections is encoded in a
.6x brightness ratio using the standard gamma of 2.2. Thus each section should appear about 2/3 its brighter neighbor, and 3/2 of its dimmer neighbor.
In this pattern, "black" is at
digital value16, and "white" at 235, which will match video sources such as DVD
players. In the lower right there is a black (16) rectangle, which will
not be visible with ideal brightness adjustment, and nearly black levels
flashing, which should be barely visible. |
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WV-45
Stairstep with +/- 5% R&G
This is a gray stairstep pattern, with the top modified to have 5% more
green and 5% less red, and the bottom third modified to have 5% less green and
5% more red. The intent of this pattern is to demonstrate what improperly
setup gray scales might look like. Note that if you keep you eyes only on
the top or the bottom for 10 to 20 seconds, then look at the center - the center
will appear incorrect! This demonstrates how the eye is subjective and can
be fairly easily tricked over short time periods. |
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WV-46 Rainbow Pattern
The arc of this pattern forms the colors of the rainbow from blue to green to
red, causing the display to do its best to approximate the spectrum of the pure,
single wavelength, colors that are found in nature. This blue to green to
red rainbow thus mimics the color spread created by the sun shining through a
prism. For reference the base of the
pattern shows the combinations of colors from blue to red, which aren't pure
colors. There are 50 marked steps between each primary color, and each
step has 2% more/less of the component color (red, green or blue) than its
neighbor. |
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WV-47 Viewing Distance -
Resolution Simulator Pattern
This pattern is intended to be displayed on a PC monitor and provide simulations
of what viewing a small section of a large screen display would be like at different
viewing distances. The pattern is divided into four quadrants that
simulate different resolutions, ranging from standard definition to very high
resolution. Included patterns include individual pixel resolution, line width, and
lines at various angles. More detailed viewing instructions are included
on the page containing the pattern. |
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WV-48a Video Level Arc, 80%
Steps
This pattern consists
of gray steps that are selected so that each step will display at roughly 80% of
the brighter adjacent step, as long as the display gamma is about 2.2.
This gray stairstep pattern thus displays levels in a logarithmic fashion, which
is generally as the eye perceives levels, so this is a good pattern to evaluate
gray scale. This pattern is intended for video ranging from 16 to 235
(black to white), so use your display's "brightness" (black level) control to
set the rectangle labeled "16" to just black. |
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WV-48b
Video Level Arc, Steps 16 to 48
This pattern shows each of the dim gray video levels ranging from 16 to 48 for a
24 bit (8 bits per color) video system. For most displays one will be able
to make out at least some of the individual steps, and this provides a measure
of the displays susceptibility "contouring" or "gradations" at this bit depth.
This pattern is intended for video ranging from 16 to 235 (black to white), so
use your display's "brightness" (black level) control to set the rectangle at
the base of the arc to just black. |
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WV-48c
Video Level Arc, Step Differences
This pattern consists of four regions, each with a "base" video level, and then
sections that are 1, 2 and 3 steps below that level, for a 24 bit (8 bits per
color) video system. This can be used to evaluate the tendency for
contouring at the difference video levels, and show just how sensitive the
display is to slight video level differences. This pattern is intended for
video ranging from 16 to 235 (black to white), so use your display's
"brightness" (black level) control to set the rectangle at the base of the arc
to just black. |
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WV-49 Equal Level
Pattern
Believe it or not, the three squares in the light background are at the same
level as the three squares in the black background. This
pattern demonstrates how the perceived relative brightness of the squares
depends the levels in the adjacent areas. A given luminance square will
appear brighter when surrounded by a dark region, and darker when surrounded by
a bright region. This is a result of the workings of the eye, which
continually adjusts and adapts to the scene. |
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WV-50 Contrast Sensitivity
Pattern
This pattern consists of alternating light-dark columns of resolution bars, ranging from a coarse
resolution (lines 27 pixels wide) on the left to a high resolution (lines 1
pixel wide) on the right. The contrast (ratio of lightness of the brighter
bars to that of the darker bars) of the bars ranges from a high contrast at the top to a
low contrast (1.02:1 for a display gamma of 2.2) at the bottom. This
pattern shows how the resolution as seen by the eye is sensitive to the contrast
level. At lower contrast levels both the finer and coarser resolution columns become
more difficult to see, while some intermediate columns become the easiest to
see. |
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