Pre-print color management of the monitor's color management

The color management of the display is very important in our production. Our entire color management should be from the color management of scanners, digital cameras, to the display's color management, to the color proofing of digital proofing and digital printing. In the production process, the most important thing is to do it from the back to the front. We must ensure the stability of the printing process after the process. Based on this, we do digital proofing. Then on the monitor, the display color management is more important. Link.

Display color management

In the monitor color management, we need two ICC files: the target color description profile and the screen color description profile. The system needs to put the ICC profile of our monitor. The application software needs to put our printed ICC profile. After we put it in the color Management is the initial correction. At this time, the corrected results mostly meet our requirements, but often there are various reasons, such as measurement errors, software errors, or some differences in our observers, which will cause some errors, so we need secondary development. The secondary correction, the so-called secondary correction, is to modify the ICC profile file because if you do not make changes, the colors you see on the monitor are often inaccurate. For example, the monitor we demonstrated on site did a dozen corrections with us, that is, after several modifications of the ICC, we can get the current results.

The environment of the monitor is very important. It is not the monitor itself. We are here to create a small observation environment for the monitor. The standard light source is used when printing originals. It is D65, ie 6500K light source. This is the standard of our country. Now International standards introduced the D50. This place is a contradiction. We believe that our country will solve this standard problem in the near future.

The standard light source must reach a certain brightness, the general standard light source is the fluorescent tube, the fluorescent tube is also not the same, the standard light source's fluorescent tube its color rendering index is bigger.

The color management environment of the monitor:

Use standard light source (D65);

The light source reaches the specified illuminance (2000 lux);

The color rendering index (CRI) of the light source is greater than 90;

Prevent outside light from entering the room

Objects in the work environment, such as walls, floors, tables, etc., should be close to neutral gray to prevent visual judgment of environmental effects.

The monitor must use a hood to prevent ambient light and stray light from directly hitting the surface of the monitor. The operator wears dark clothes to prevent the clothes from reflecting light onto the screen.

Monitor color management software and hardware:

Color Management Software: Supports many spectrophotometers, such as Gretag's ProfileMaker, Xrite MonacoProfiler, and ViewOpen at Heidelberg.

Separate instruments and bundles, such as Eyetag and EyeOne Match from Gretag, DTP94 from Xrite and
MonacoOPTIX.

The monitor is bundled with supporting software and instruments, such as the EIZO CG Series monitor and software ColorNavigator.
Gretag's EyeOne is bundled with Xrite's DTP94.

Manual visual adjustment

The basic method of monitor color management

Calibration

Calibration is to make the display to adjust according to its own characteristic curve, and the display will display the best color display through calibration as the basis for generating the feature description file.

The monitor needs to be adjusted according to the requirements of the software

Brightness

2. Comparison

3. Color temperature (6500K recommended)

4. Gamma (2.2 recommended)

Characterization

Display features

Description file:

The feature description refers to using the digitized method to describe the color performance of the display in detail. That is, the ICC Profile is used to describe the color space of the display.

Precautions:

1. Monitor warms up for at least 30 minutes

2. Clean the screen with no fingerprints and dust

Convert color space (Conversion)

Color conversion refers to a one-to-one mapping relationship between different color spaces according to different colors, and the colors in the color space of the target device are converted into the color space of the display. Since the color gamut of the target output device is generally smaller than the color gamut of the display, it is necessary to compress a large color gamut in a small color gamut. The conversion is done by computer systems and application software.

Display color management evaluation:

Evaluation principle: Based on data, based on visual inspection

comment content:

1, white
2, black
3, neutral gray
4, color

Visual observations should be taken with the correct angle of observation. The color management of the screen can not rely solely on data, otherwise it may find it difficult to achieve the required color matching results, the data is the reference for adjustment, and the visual inspection result is more accurate. But you must master the visual method.

Author: Chen Zhiwei