Eizo ColorEdge CG222W - Manual (Page 4)

4
Factory Adjustment Of Gamma
The gamma level for
each ColorEdge monitor
is adjusted at the factory.
This is accomplished by
measuring the R, G, and
B gamma values from
0 – 255, then using the
monitor’s 12-bit or 10-bit
look-up table (LUT) to
select the 256 most
appropriate tones to
achieve the desired value.
This is important
because accurate, non-
fl uctuating gamma
values are necessary for
the proper display of
color. If colors are not
based on specifi c values
and cannot be adjusted,
images will be displayed
differently by different
monitors. ColorEdge
monitors provide both
precision and con-
sistency, so graphics
professionals can be sure
that the fi nal product
will look exactly the way
they want it to. In fact,
each monitor comes with
an adjustment certifi cate
that certifi es the mea-
surement results of the
gamma value.
16-Bit Internal Processing
CG301W · CG241W · CG222W · CG221 · CG211
In any color-critical work, the monitor’s ability to produce
black is a great differentiator. With most LCD monitors,
the darkest area of the screen — or black level — is usually
too bright. This leads to banding and washing out of dark grays and
dark colors. With 16-bit internal processing, these models not only
come very close to producing a true black, but the lowest grayscale
tones can be distinguished from one another for a greater level of
detail in dark areas. (CG210-N and CG19 have 14-bit and 10-bit
internal processing respectively.)
Uncorrected
Gamma Curve
Ideal Gamma Curve
ON-SCREEN IMAGE
GAMMA CURVE
Brightness Brightness
256 Tones
256 Tones
Color Seepage
Tonality Breakup
Smooth Grayscale Display
Ideal Gamma Curve
Gamma Correction
Brightness and Color Uniformity with DUE
CG301W · CG241W · CG222W · CG221 · CG211
Fluctuations in brightness and chroma on different parts of the
screen are a common trait of LCD monitors. To counteract this,
EIZO incorporates a Digital Uniformity Equalizer (DUE). DUE
utilizes the monitor’s 12-bit look-up table (LUT) with an extensive
palette of 4,081 grayscale tones for each R, G, and B, and internal
calculation accuracy of 16 bits to ensure a Delta-E difference of 3 or
less across the screen when the monitor leaves the factory.*
*Delta-E difference for the CG301W is 5 or less along the screen perimeter.
Short- and Long-Term Brightness Stabilization
Stable brightness is a key factor
in achieving accurate color. However,
fl uctuations in backlight brightness
normally occur from startup and can
last for up to two hours. Furthermore,
changes in ambient temperature can
cause brightness levels to fl uctuate,
as can the inevitable deterioration of
the backlight’s fl uorescent lamp over
time. An EIZO pat-
ented backlight sensor
incorporated in all
ColorEdge monitors
detects and counteracts
these infl uences so
brightness is always
stable and product life
is extended.
Color Vision Defi ciency Simulation
CG301W · CG241W · CG222W
To accommodate the more than 200 million people worldwide
with a color vision defi ciency, care must be taken when choosing
color schemes, otherwise important details may not be discernible.
These models instantly simulate how still and moving images ap-
pear to people with red-green color vision defi ciency (protanopia
and deuteranopia) through internal hardware conversion and EIZO
proprietary software. (Compatible with Windows Vista and XP, and
with Macintosh OS X 10.3.9 or later.)
Each monitor adjusted individually at the
factory. (For illustrative purposes only. Actual
adjustment is performed in a darkroom.)
16-bit v. 10-bit processing
Error Rate (%)
0
2
1
0
-1
-2
-3
2
1
0
-1
-2
-3
32 64 96 160 192 224 255 128 0 32 64 96 160 192 224 255 128
Error Rate (%)
Internal 16-Bit Processing Internal 10-Bit Processing
Tones (0 – 255) Tones (0 – 255)
With 10-bit processing, the error rate is high in low tonal areas during calcula-
tion. With 16-bit processing, accuracy is signifi cantly improved resulting in
fewer conversion errors.
The Hardware: Consummate Performance and Functionality
Deuteranope mode Original mode
Preset Value
ColorEdge
Without Brightness
Drift Correction
Brightness (cd/m2)
Minutes
Color-separated image with Delta-E*ab distribution across the screen of the
ColorEdge CG221 (gray level 128 measured)
With Digital Uniformity Compensation Without Digital Uniformity Compensation
Hole for
Light
Trans-
mission
Backside
of Panel
Main
Board
Sensor