Printing problems of color box packaging

Color box packaging products in the production of color rehabilitation problems often occur, such as neutral gray off-color, and then affect product quality, which in addition to the equipment itself, the level of production personnel skills problems, the key to a problem is the enterprise failed to carry out useful color processing and the reasonable use of ink.

　　Color handling that is to handle people’s sense of color, the intention is to make the entire process of imitation of the picture to complete the transformation between the color, to ensure that the color of the picture from the input to the output of the appearance shown in the best possible match, and finally arrived at the original and the imitation of the color of the product and the common color.

　　Picture imitation need to go through the picture of the acquisition, processing, color separation, printing and other stages, at each stage, the color information will be used in accordance with the equipment used at the time of the color rendering and color depiction of the characteristics of the display. Different scanning and display equipment on a common sheet of the original will have different color display. In addition, the use of RGB three-color color rendering of the display screen and four-color color rendering of the printing ink between the color expression talent is not the same, coupled with the use of different RGB data converted to CMYK is also a lack of commonality, the use of different papers and inks, the prints obtained are not the same. Therefore, it is necessary to control the production system through the color handling of the various types of equipment and media on the color recovery.
Color handling content

　　Establishment of equipment color depiction file (Profile) is the center of color processing, depiction file has a representative of each device color characteristics, such as chromaticity characteristics of the curve, lose the outstanding color gamut characteristics of the curve, etc., the color processing system to use these representative of the color characteristics of the equipment to complete the matching and transformation of the color space.

　　Color processing, must follow a series of polite operation process, in order to arrive at the expected results. Color processing in fact is divided into three methods, referred to as “3C”, that is, calibration (Calibration), characterization (Characterization) and transformation (Conversion).

　　Calibration: In order to guarantee the color information transfer process of invariance, * and sustainability, the requirements of the input, display, output equipment calibration, in order to ensure that they are in the norms of responsibility shape. Input calibration search for scanners, such as brightness, contrast, mixed field calibration. To ensure that about the common copy of the original, regardless of when the scanning, should be able to obtain the same picture data.

　　Through the brightness of the display, contrast, color temperature and the entire display system Gamma value setting, so that it accurately display color. Output proofreading search for printers, typesetters, printers and proofreaders, the characteristics of its proofreading, so that the device can be in accordance with the factory’s standardized characteristics of the output.

　　Characterization: the characteristics of all the equipment after proofreading records, is the process of characterization. These characteristics of the description of the document is a bridge from the device color space to the standard device-independent color space (PCS) for the transformation.

　　Transformation: On the basis of the calibration of the system equipment, the use of equipment depiction files to standardize the device-independent color space for the preamble, to complete the accurate transformation between the various equipment color space. Because the color gamut of the output device than the original, the scanner, the color gamut of the display is narrow, and therefore the need to shorten the color gamut in the color conversion, color gamut shortening in the ICC protocol and have a definite chromaticity method, relative chromaticity method, the method of saturation and the feeling of the method of the four methods of highlighting.

The implementation of color handling

　　Briefly speaking, a packaging and printing enterprises to do a good job of color processing, the need for a standard condition of the light source; high-quality color characteristics of the document generation; to improve the old generation of color processing system; standardized measuring instruments and testing equipment; standardized color color target; standardized printing; standardized remote digital proofing color processing; standardized scanning and rehabilitation, digital camera color processing; standardized monitor proofreading and Screen soft proofing. In the detailed implementation of the process of color handling, should do the following aspects: careful to do a good job of printing the whole process of standardization, standardization, data production processing, which is the use of ICC color processing prerequisites and fundamentals.

　　Enterprises should be strictly formulated fine product quality specifications, paper, ink and other raw and auxiliary materials and equipment, the specification of the absence of defects, measuring instruments and the condition of the light source specifications, the formulation of standardized handling of documents, etc., and require everyone to strictly in accordance with the norms to perform. Visualizer, soft proofing, printer ICC files, printing machine parameters to standardize, and quantify the norms and specifications within the norms, in all able to express the local data, by means of testing, summarize the number of quality can be guaranteed!