Calculate ash balance by iccprofile

Using ICC profile file to calculate gray balance

gray balance is a commonly used concept in printing. It represents the point percentage relationship of yellow (y), magenta (m) and cyan (c) of primary inks that generate a series of neutral gray colors. Some people use the density relationship of yellow, magenta and cyan to measure the gray balance. In practical application, especially in the pressure maintaining stage, the pressure has a greater impact on the shrinkage of products. In most places, the gray balance is expressed by the percentage relationship of CMY points. Gray balance control is the most basic control element in printing. Only when gray balance is realized can color deviation be avoided in printing. The grey balance relation of CMY is also a data relation often used in pre press processing and process control. For example, the grey balance data relationship is used for the generation of black version and the calculation of grey component substitution (GCR) in the pre press color separation setting; The gray control bar that provides specific functions on the printing page is actually used to check whether the gray balance is realized or not, and it is also a form of gray balance relationship application

ash balance is actually a feature of the equipment. Its meaning is the relationship between the amount of CMY showing neutral gray color under the normal operation of the equipment. Therefore, it should be a part of the iccprofile in color management, or the iccprofile contains gray balance information. The equipment concept here is a broad concept. It not only refers to the printing machine, but also includes color output equipment such as printers and proofing machines. In fact, the characteristics of the equipment here refer to the comprehensive embodiment of the running state of the machine and its ink characteristics

there are many ways to obtain the grey balance relationship of the equipment. The usual method is to see which combination of points has the closest color to gray through the combination of different points. This paper introduces a method to calculate the gray balance of equipment by using the color characteristic file

step 1? Debug the equipment to make it in normal working condition

step 2? Print a color code for creating an iccprofile. The modified version adopts different methods - piano black high angle column, such as it8.4 color code

step 3? Measure the color value of the color code on the color measuring equipment (either spectral value or lab value)

step 4? Create a black version free iccprofile file in profilemaker or other iccprofile creation software. Figure 1 shows the settings for creating a black free iccprofile file in profilemaker. Here, select NOK in the separation and set the total amount of ink cmykmax to 290, and then a black version free iccprofile file can be generated. In the experiment, we calculate the gray balance for epsonstyluspro4000 color printer, and the stored file is C

step 5? Create a table file in Excel, and define a group of neutral gray color values in the table. L is 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 65, 70, 75, 80, 85, 90, 95, 100. A and B values are 0, as shown in Figure 2. In fact, this is a gray scale. Note that the header data format here should meet the requirements of the colorthinkpro software to be applied below, so that it can be read in the colorthinkpro software

step 6? Open the table file in colorthinkpro software, simulate the conversion of color space in the software, select the ICC file for the conversion from B to a space as C, and you can see that the lab value is converted to the color value of CMYK color space, and the K value is 0, as shown in Figure 3. This is because C is an ICC file without black version. The CMY value corresponding to each luminance value L in the figure is the gray balance relationship we are looking for. Figure 4 shows the final calculated epsonstyluspro4000 color print. The "electronic tensile testing machine" and "electronic pressure testing machine" are also included in this standard (Chapter 1 of 1996 edition; Chapter 1 of this edition); 2) Delete one term (3.1 of 1996 edition); 3) Some contents of "Table 1 symbols" have been modified (Table 1 of 1996 edition; table 1 of this edition); 4) Some contents of the main parameter series have been modified (Chapter 4 of 1996 edition; Chapter 4 of this edition); 5) The two levels of level 2 and level 3 in the classification of the experimental machine (5.2 in 1996 version and 5.2 in this version) are cancelled; 6) The requirements for coaxiality of the testing machine with maximum capacity not greater than 5kn (5.3.2.1 of 1996 version; 5.3.2.1 of this version) are modified; 7) The requirements for the hardness of zigzag indenter and its two supports (5.3.4.1 in 1996 version and 5.3.4.1 in this version) are added; 8) The provisions allowing the moving beam to adjust speed by stages and the corresponding grading number system (5.3.5.2 of 1996 edition and 5.3.5.2 of this edition) are cancelled; 9) The provisions on speed relative error index and speed detection time of grade 0.5 testing machine (5.3.5.3 and 6.3.7 of 1996 version; 5.3.5.2 and 6.3.9 of this version) 10) are modified. The contents related to calibration value drift and recording device of electronic universal testing machine (5.4.1.4 and 5.4.3 of 1996 version; 5.4.1.4 of this version) are deleted; 11) The zero relative error, discrimination threshold, zero drift technical index and calculation method of the force measuring system are modified (5.4 and 6.4 of 1996 edition; 5.4 and 6.4 of this edition); 12) Regulations on technical requirements and measurement methods of control system are added (5.7 and 6.7 of this version); 13) The technical requirements and testing methods of computer data collection system (5.8 and 6.8 of this version) are added; 14) Modified the gray balance relation of some technical indexes of the extensometer. Colorthinkpro software is a powerful color management software developed by chromix