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This article describes some of the technical problems with color devices and how to implement color management on win98 and win2000 platforms.
Color management
If the image is scanned by a scanner to make a digital document for desktop publishing, the user certainly hopes that the final printed or printed copy can be very similar to the original image. If color correction is also done, it is hoped that the color of the final print will be the color displayed on the screen when the correction is made. ICM can describe the color characteristics of an image, manage color data, and obtain high-quality color reproductions.
With more and more types of color devices and products, the difficulty of displaying high-quality color images on a display or printer has also drawn increasing attention. Color devices such as scanners, digital cameras, monitors and printers are beginning to enter the home. People hope that they can also make beautiful pictures such as colorful magazines, but many of the technologies and artistic knowledge and skills involved are not for everyone. Can be easily mastered.
The goal of color management is to enable people to easily scan, photograph, display, and print high-quality color pictures without having to rack up their brains to learn all kinds of techniques that could only be mastered by very skilled technicians in the past. For color management, it is mainly the software part, which plays a central role; but the data of the hardware device and its description file only provide operable information, so that the software part can be truly personalized color management.
The color system shown in Figure 1 describes some typical peripheral devices that users may encounter: The PC manages the communication between peripheral devices, so it must have a proper interface with different peripheral devices with different color rendering characteristics.
Figure 1: Typical color system
There are three terms that are important: calibration calibration, characterization, and device profile profile
After the device is calibrated, the known value of the input should be able to anticipate the result of its output. For example, a reflection effect of 0.65 can be obtained by the printer printing images with R, G, and B values ​​of 255, 127, and 0, respectively. To characterize a device is to enter a series of values ​​into the device and measure the results separately. The difference from the calibration process is that characterization does not pre-estimate the possible results. When you enter the values ​​127, 127, and 127 into the device, it is generally assumed that you will get a neutral gray, but the result is likely to be another color. After the characterization is done, enter a value to get a specific color effect for that particular device.
The device profile file can be thought of as an inverse function of characterization. For example, if you want to get neutral grey, the profile file will tell you that the RGB values ​​that should be entered are 131, 122, and 119 (here is just an example), instead of 127, 127, and 127 because good characterization data can indicate the value of the input and The relationship between output effects. The profile file can tell you how much to get a certain color for this input. Most of today's CMS solutions work this way.
Figure 2 depicts a simple color management workflow. The CMM Color Management Module generates device-sized signal values ​​based on the device profile. If the color device is properly characterized, the CMM should be able to produce the desired effect. For example, with the display and printer profile files, the same image displayed by the display and the printer should be very similar.
Figure 2. Simple color management system
Implement color management on color devices
The color rendering properties of a color device are not static. For example, after a period of time, the monitor on your desk shows the same picture, and the effect will be different; if the color printer has changed paper or ink, the humidity will change or the printing effect will be different after a period of time.
The characteristics of the printer, the generated profile file has a certain period of validity. Once the paper or other consumables have been replaced or the printer has been manually adjusted, the printout is likely to be unexpected. In addition to professional publishers, most people do not use professional color measurement instruments. These instruments are expensive and require skilled use.
The electron gun of the monitor has a certain service life, different combinations of red, green and blue light will change the imaging effect of the monitor. There are many adjustments to the display, especially the adjustment of the cathode ray tube CRT can change the brightness contrast and even the color balance. Users can also set the gamma value manually. The aging and poor maintenance of the display will increase the difficulty of the CMS, change the display color characteristics, and change the basic data on which the profile file depends.
Implement color management on the monitor
Color displays are the easiest to characterize and generate profile files. The display and the graphics card communicate with each other, and the operating system is used to represent the color image. Users can manually adjust the display and graphics card, but changes made to the brightness, contrast, and color balance must be able to be loaded into the operating system.
Future display systems will use simple sensors to detect brightness, color balance, or "white field." The display should be capable of real-time communication with the color rendering state at that time, adjusting the offset and error occurring at any time. The display and graphics card vendors should enable the operating system to intervene in the imaging system to simplify the upgrade of the display profile and implement correct color management.
The liquid crystal display is followed by a dye-based filter. The filter is stable in nature, has a long life, and the color rendering performance of the display screen is also quite stable. With the advent of liquid crystal display LCDs for desktop publishing, the importance of graphics cards and operating systems has become increasingly prominent. Any adjustments made to the monitor should be read by the operating system. Other types of display technologies such as FEDs, digital mirroring devices, etc. must also reflect feedback to the operating system.
Points to note when designing a monitor:
Display device features such as brightness and contrast must be recognized and processed by the operating system for proper color management.
Adjustments to the graphics card, such as gamma adjustments, must also be recognized by the operating system.
Still, the color rendering characteristics of the display and graphics card should be set by the operating system.
Scanners, digital cameras and color management
Input devices such as scanners and digital cameras involve additional problems. The scanner usually comes with software to control the imaging. But any adjustment should be able to enter the operating system, and then enter the color management software. The scanner's status settings should also be entered into the operating system and used by color management software.
Digital cameras use external light sources, either direct sunlight, cloudy daylight, home white lighting, or office fluorescent lights. Natural light may have many variations in spectral distribution and intensity. Various problems may affect the quality of digital pictures. However, if you can know the approximate brightness of the environment, then with CMS, this process will be much easier. Perhaps each digital camera should be equipped with a simple but effective RGB sensor on the body to detect the ambient brightness.
Points to note when designing a digital camera or scanner:
Bi-directional communication between the scanner and operating system must enable the color management system to receive scanner or digital camera settings such as brightness and contrast.
Both the digital camera and the scanner should be controlled by the operating system. Any settings that may affect the image quality should be transmitted to the color peripheral through the operating system.
It is more convenient to set up peripherals through a color management system. If the user knows the profile file of the scanner he wants to use, he can immediately send the data information to the scanner through the operating system.
Printer and color management
Due to the large number of factors, the printer can be said to be the most difficult part of the color management system. The way in which color is represented by the printer is very different from how it behaves on a digital camera or scanner. This is a subtractive color method. The three primary colors are C, M, and Y. They are represented by toner and ink droplets. In order to achieve better performance in dark and dark, and to save printing costs, black ink is generally used.
There are many kinds of printing technologies, such as thermal, electrostatic, ink jet, etc. Paper has a great influence on printing because toners, dyes, etc. interact with the surface of the paper very complexly. For display devices, to generate their profile files may need to measure tens of hundreds of color patches; scanners and digital cameras need to measure about 200 color patches; and printers need to print and measure hundreds or even thousands of color patches, This is a painful process that often requires the provision of professional instruments worth several thousand dollars, which can take hours or even hours.
Printer manufacturers should consider adding a printer's self-test feature that eliminates the need to print hundreds of color patches and only a few key color patches. A more sophisticated color management system can then read and process these measurement information and generate a new profile file. The current development of color management technology has taken this into consideration, and printer manufacturers should also clearly recognize this and make their own efforts.
Points to note when designing a printer:
The printer is ready to communicate with the user to adjust the color.
Internal monitoring capabilities should be able to monitor the density and spectral data of printed colors.
The printer should be able to "download" paper and ink characteristics to some extent for use by the operating system and advanced color management software to control printer output.
Developers should not expect that users will be able to independently perform spectral measurements and generate profile profiles for color devices. Only prepress and other professional users can do this.
to sum up
To get a high-quality color image, keep in mind, "If you can't measure, you can't control it."
If hardware manufacturers can provide good communication and control for their products, operating system and color management software can compensate for the state drift of hardware devices. With future color management, stable and high-quality color reproduction can be achieved with very few people.
Device manufacturers should implement bidirectional communication between peripheral devices and computer operating systems and color management software for various parameter settings that affect color reproduction.
Mature color devices should allow the color management system to obtain any user-allowed device state drift information so that the device's profile file can be updated at any time.
Device parameters should be set by the color management system through the operating system, so that it can immediately reach a working status based on a previous color rendering performance.
For more information on the ICCprofile file, visit the International Color Consortium website http://
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Plastic Zip Puller: We offer color size and shape customization
A: the price depends on the order quantity.
2.What's the delivery time?
A:sample order will be delivered at 5-7 workdays,large order is 7-15 days after confirming the details
3.What's your packing?
A:Our usual packing for Manufacturer 5# 3# sporty style plastic zipper slider is opp bag, then packed in export carton.
4.How about oem?
A: customized color and size is ok, we can do your logo and design for the printing, usually need to charge for the mold fee for small orders
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A: We are very confident in our products, each Manufacturer 5# 3# sporty style plastic zipper slider was tested ok here,and we pack them very well, so usually you will receive your order in good condition. But to avoid any subsequent trouble regarding quality issue, we suggest that you check Manufacturer 5# 3# sporty style plastic zipper slider once you receive them,and let us know the details if there is any damaged ones, so that we can deal with it accordingly.
6.Does your factory audit?
Yes,our factory is audited by TüV Rheinland .
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