For the color profile of the equipment in the printing enterprise, the operator of the graphic information processing is obtained in two ways.
The first way is when the device is purchased, the profile provided by the manufacturer along with the device, which can meet the general color management requirements of the device. When the device application software is installed, the profile is loaded into the system.
The second way is to use the special profile creation software to generate the applicable color characterization files according to the actual situation of the existing equipment. The generated files are usually more accurate and more in line with the actual situation of the user. As the state of equipment, materials, and process flows change or shift over time. Therefore, it is necessary to re-create the profile at intervals to adapt to the color response at the time.
Now let's take a look at how colors are passed on each device.
First, for an original with a normal color, it is first scanned by a scanner. Due to the scanner's profile, the color (ie, the red, green, and blue tristimulus values) from the scanner is provided to the CIE1976Lab color. The correspondence of the spaces, and thus the operating system can obtain the chromaticity value Lab of the original color according to this conversion relationship.
The scanned image is displayed on the monitor screen. Since the system has mastered the correspondence between the Lab chromaticity value and the red, green, and blue driving signals on the display, when displaying, instead of directly using the red, green, and blue chromaticity values ​​of the scanner, In the Lab chromaticity value of the previous document, according to the conversion relationship given by the profile of the display, a red, green, and blue display driving signal capable of correctly displaying the original color on the screen is obtained, and the display is driven to display the color. This ensures that the color displayed on the display matches the original color.
After the operator observes the accurate image color display, the image adjustment processing can be performed according to the screen color according to the customer's request, and since the profile of the printing device is included, after the image separation, the correct color after printing can be observed on the display. When the operator is satisfied with the color of the image, the image is color separated and stored. When color separation, according to the color conversion relationship carried by the profile of the printing device, the correct percentage of dots is obtained. After RIP (Raster Image Processor), recording and printing, printing, proofing, and printing, a printed copy of the original can be obtained, thereby completing the entire process.
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