Eizo ColorEdge CG211 Calibration Color LCD Monitor Manual de usuario descargar pdf (Pagina 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-

ﬂuctuating gamma

values are necessary for

the proper display of

color. If colors are not

based on speciﬁc 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 ﬁnal 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.

16-Bit Internal Processing

CG301W · CG243W · CG241W · CG222W · CG221 · CG211

In any color-critical work, the monitor’s ability to pro-

duce 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. (The CG19 has 10-bit internal

processing.)

Uncorrected

Gamma Curve

Ideal Gamma Curve

ON-SCREEN IMAGE

GAMMA CURVE

Brightness

256 Tones

Color Seepage

To nality Breakup

Smooth Grayscale Display

Ideal Gamma Curve

Gamma Correction

Brightness and Color Uniformity with DUE

CG301W · CG243W · 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,

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

time. An EIZO pat-

ented backlight sensor

incorporated in all

ColorEdge monitors

detects and counteracts

these inﬂuences so

brightness is always

stable and product life

is extended.

3D LUT for Better Additive Color Mixture

CG243W · CG222W

All ColorEdge models

incorporate a look-up table

(LUT) for accurate color and

grayscale rendering, but the

latest models, the ColorEdge

CG243W and CG222W, utilize

a new EIZO-developed 3D

LUT. Whereas a typical 1D

LUT adjusts color on separate

tables for each red, green, and

blue, a 3D LUT accomplishes this on a single, mixed-color cubic

table. A 3D LUT improves the monitor's additive color mixture (com-

bination of RGB), a key factor in its ability to display neutral gray

tones.

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 (%)

-1

-2

-3

-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

To nes (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.

The Hardware: Consummate Performance and Functionality

Preset Value

ColorEdge

Without Brightness

Drift Correction

Brightness (cd/m

)

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

3D LUT image

1 2 3 4 5 6 7 8

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