Perfect color reproduction, from the image acquisition, processing and processing, color separation, printing and other links. Because in each link, the color information will be represented according to the color rendering principle and color description characteristics of the device currently used. Different scanning and display devices will have different color performances on the same original; in addition, the color expression capability between the RGB three-color color display screen and the four-color color printing ink is different, and different application software will There is also a lack of consistency in the conversion of RGB data into CMYK. Using different papers and inks, the resulting prints are also different. Therefore, it is necessary to control color reproduction on various devices and media through color management techniques.
Color Management Bridge
Establishing the device's color profile is the core of color management. The representative file has representative color features of each device, such as the chromaticity characteristic curve, the output color gamut characteristic curve, etc. The color management system uses these to represent Sexual color features enable the matching and conversion of the color space of each device.
Color management must follow a series of prescribed operating procedures in order to achieve the desired results. Color management is divided into three steps in principle, referred to as "3C", namely Calibration, Characterization, and Conversion.
Calibration: In order to ensure the stability and sustainability of the color information transmission process, calibration of the input, display, and output devices is required to ensure that they are in standard operating conditions. The input correction includes the brightness, contrast, and correction of black and white fields of the scanner and the like. To ensure that for the same original, whenever scanning, you should be able to obtain the same image data.
By setting the display's brightness, contrast, color temperature, and the gamma value of the entire display system, it accurately displays colors. The output correction includes the correction of printers, imagesetters, printers, and proofers. After correcting the characteristics, the device can be output according to the factory-standard characteristics.
Characterization: Recording the corrected characteristics of all devices is a characteristic process. These feature description files are bridges from device color space to standard device-independent color space (PCS).
Conversion: Based on the calibration of the system equipment, using the device description file, the standard device-independent color space is used as the medium to achieve the correct conversion between the color spaces of the devices. Since the color gamut of the output device is narrower than the color gamut of the original document, scanner, and display, the color gamut needs to be compressed during color conversion. In the ICC protocol, color gamut compression has absolute colorimetry and relative colorimetry. Highlight four methods of saturation and sensory methods.
Learn about ICC
ICC Color Profile (ICC) is a device color profile that describes the characteristics of different devices in terms of color performance. The ICC file is the basis of color management implementation. Only with the ICC file as a bridge can software (such as photoshop) with color management functions accurately display the color conversion on different devices and change according to the color characteristics of different devices. At the same time, it also allows the color to be lost during the transfer process on different devices. The smallest ICC file is all the device-dependent color data (RGB and CMYK data), one by one, to the device-independent Lab color mode. Thus through the Lab mode as a mediator, to maintain the consistency of the appearance of all colors, it also maintains the color and then change the device does not change color transfer.
Hardware devices in each color flow, including displays, inputs, and outputs, should have their own ICC profiles that describe the color gamut characteristics of various devices in a hardware-independent color space, enabling corresponding color management. The software adapts the transfer and conversion of colors between scanners, digital cameras, color displays, proofing devices, printers, and other devices based on ICC profiles. Under the guarantee of ICC standard, the characteristic file of the apparatus can realize the accurate picture display and output, namely the true seeing and gaining. Due to the introduction of these color management software and good compatibility, the operator has been freed from a large number of tedious manual color correction operations due to the use of non-standard modes.
Color Management Bridge
Establishing the device's color profile is the core of color management. The representative file has representative color features of each device, such as the chromaticity characteristic curve, the output color gamut characteristic curve, etc. The color management system uses these to represent Sexual color features enable the matching and conversion of the color space of each device.
Color management must follow a series of prescribed operating procedures in order to achieve the desired results. Color management is divided into three steps in principle, referred to as "3C", namely Calibration, Characterization, and Conversion.
Calibration: In order to ensure the stability and sustainability of the color information transmission process, calibration of the input, display, and output devices is required to ensure that they are in standard operating conditions. The input correction includes the brightness, contrast, and correction of black and white fields of the scanner and the like. To ensure that for the same original, whenever scanning, you should be able to obtain the same image data.
By setting the display's brightness, contrast, color temperature, and the gamma value of the entire display system, it accurately displays colors. The output correction includes the correction of printers, imagesetters, printers, and proofers. After correcting the characteristics, the device can be output according to the factory-standard characteristics.
Characterization: Recording the corrected characteristics of all devices is a characteristic process. These feature description files are bridges from device color space to standard device-independent color space (PCS).
Conversion: Based on the calibration of the system equipment, using the device description file, the standard device-independent color space is used as the medium to achieve the correct conversion between the color spaces of the devices. Since the color gamut of the output device is narrower than the color gamut of the original document, scanner, and display, the color gamut needs to be compressed during color conversion. In the ICC protocol, color gamut compression has absolute colorimetry and relative colorimetry. Highlight four methods of saturation and sensory methods.
Learn about ICC
ICC Color Profile (ICC) is a device color profile that describes the characteristics of different devices in terms of color performance. The ICC file is the basis of color management implementation. Only with the ICC file as a bridge can software (such as photoshop) with color management functions accurately display the color conversion on different devices and change according to the color characteristics of different devices. At the same time, it also allows the color to be lost during the transfer process on different devices. The smallest ICC file is all the device-dependent color data (RGB and CMYK data), one by one, to the device-independent Lab color mode. Thus through the Lab mode as a mediator, to maintain the consistency of the appearance of all colors, it also maintains the color and then change the device does not change color transfer.
Hardware devices in each color flow, including displays, inputs, and outputs, should have their own ICC profiles that describe the color gamut characteristics of various devices in a hardware-independent color space, enabling corresponding color management. The software adapts the transfer and conversion of colors between scanners, digital cameras, color displays, proofing devices, printers, and other devices based on ICC profiles. Under the guarantee of ICC standard, the characteristic file of the apparatus can realize the accurate picture display and output, namely the true seeing and gaining. Due to the introduction of these color management software and good compatibility, the operator has been freed from a large number of tedious manual color correction operations due to the use of non-standard modes.
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