For the color characteristic files of equipment in printing enterprises, the operator of graphic information processing has two ways to obtain them.
The first way is when the device is purchased, the manufacturer provides the profile with the device, which can meet the general color management requirements of the device. When the application software of the device is installed, the profile is loaded into the system.
The second way is to use special profile production software, according to the actual situation of the existing equipment, to generate a suitable color feature description file, so that the generated file is usually more accurate and more in line with the user's actual situation. Because the state of equipment, materials and process flow will change or shift with time. Therefore, the profile needs to be re-created at intervals to adapt to the color response at the time.
Now, let's take a look at how colors are transmitted in each device.
First, for a manuscript with normal colors, scan and input it with a scanner. Due to the profile of the scanner, the color from the scanner (that is, the tristimulus values ​​of red, green, and blue) to the CIE1976Lab chromaticity is provided. Correspondence relationship of the space, so the operating system can obtain the chroma 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 Lab chromaticity values ​​and the red, green, and blue drive signals on the display, the display does not directly use the chromaticity values ​​of the scanner's red, green, and blue, but from In the Lab chromaticity value of the original in the previous step, according to the conversion relationship given by the profile of the display, the display drive signals of red, green and blue that can correctly display the color of the original on the screen are obtained, and the display is driven to display the color. This ensures that the color displayed on the monitor matches the color of the original.
After observing the accurate image color display, the operator can adjust the image according to the color of the screen according to the customer's requirements. Since the profile of the printing device is included, after the image is separated, the correct color after printing can be observed on the display. When the operator is satisfied with the color of the image, the color is separated and stored. When color separation, according to the color conversion relationship carried by the profile of the printing equipment, get the correct percentage of dots. After RIP (raster image processor), record printing, printing, proofing, printing, you can get a printed copy of the original to complete the entire process.
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