Eizo CG222W manual Hardware Consummate Performance and Functionality, Bit Internal Processing

The Hardware: Consummate Performance and Functionality

Factory Adjustment Of Gamma

Brightness and Color Uniformity with DUE

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- fluctuating gamma values are necessary for the proper display of color. If colors are not based on specific values and cannot be adjusted,

Each monitor adjusted individually at the factory. (For illustrative purposes only. Actual adjustment is performed in a darkroom.)

Gamma Correction

ON-SCREEN IMAGE

Color Seepage Tonality Breakup Smooth Grayscale Display

GAMMA CURVE

Brightness	Ideal Gamma Curve	Brightness	Ideal Gamma Curve
	Uncorrected

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.*

With Digital Uniformity Compensation Without Digital Uniformity Compensation

Color-separated image with Delta-E*ab distribution across the screen of the ColorEdge CG221 (gray level 128 measured)

*Delta-E difference for the CG301W is 5 or less along the screen perimeter.

Short- and Long-Term Brightness Stabilization

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 certificate that certifies the mea- surement results of the gamma value.

Gamma Curve

256 Tones 256 Tones

Stable brightness is a key factor in achieving accurate color. However, fluctuations 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 fluctuate, as can the inevitable deterioration of the backlight’s fluorescent lamp over

	Backside
	of Panel
Main	Hole for
Board
	Light
	Trans-
	mission

Brightness (cd/m2)

ColorEdge

Preset Value

Without Brightness

Drift Correction

Minutes

time. An EIZO pat- ented backlight sensor incorporated in all ColorEdge monitors detects and counteracts these influences so brightness is always

16-Bit Internal Processing

CG301W · CG241W · CG222W · CG221 · CG211

Sensor

stable and product life is extended.

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.)

16-bit v. 10-bit processing

Error Rate (%) Error Rate (%)

2									2
1				Internal 16-Bit Processing					1				Internal 10-Bit Processing
0									0
-1									-1
-2									-2
-3									-3
0	32	64	96	128	160	192	224	255	0	32	64	96	128	160	192	224	255
			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 significantly improved resulting in fewer conversion errors.

4

Color Vision Deficiency Simulation

CG301W · CG241W · CG222W

To accommodate the more than 200 million people worldwide with a color vision deficiency, 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 deficiency (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.)

Original mode Deuteranope mode