The linearization of the imagesetter is a very important part of the output operation. This part of the operation determines the correctness of the solid density and dot tone value of the output film. The linearization of imagesetter is a critical step in print color management, because it directly affects the printing results. Most imagesetters are provided with some linearization software. For those who do not have linearization software, you can use the color correction software used by the special publishing service department. These software can complete the linearization of most imagesetters, and the accuracy is very High, can create the correction function in RIP, so that the output result is stable and reliable. If it is ensured in the output operation that the imagesetter can produce a linearized output, it can produce color separations consistent with the digitized file. During the linearization operation of the imagesetter, first of all, we must ensure that the film density output by the imagesetter must reach the standard, and then test and adjust the percentage value of the output film dots. This operation is mainly to use the linear Function or other special linearization software. After that, save the linearization file for later recall when exporting. This article will use the Founder Century RIP-PSPNT output software and the Japanese screen 5055 laser imagesetter as an example to introduce the linearization operation process of the imagesetter in detail. 1. Testing and adjusting the solid density of the output film The field density of the film output for various printing methods and prints has been formulated in China. Therefore, adjusting the field density of the output film needs to be treated differently for different prints and printing methods. For example, for the printing of most newspapers at present, the third part of the national standard GB / T17934.3-2003 "Cold-set Ink Offset Printing of Newsprint" should be implemented. This standard specifies that the solid density value of the color separation film must be greater than or equal to 3.5; For some other printed products, the field density value must not be lower than 4.0, and some high-end printed products are higher than 4.0. Because there are many printing companies, especially small and medium-sized printing companies, that do not have professional film field density testing capabilities, (density meter is not purchased) most of the film field density testing through magnifying glass or visual inspection based on experience; in addition, different brands of development potions And other factors have different effects on the solid density value of the film output, plus the development temperature in different seasons and the use of different brands of laser imagesetter also have different effects on the solid density value of the film. This will cause the field density value to be very unstable during actual output and fail to meet the results required by the national standards. The main tool for testing the on-site density of the output film is the density meter, which is used to test whether the output density of the 100% dots of the output dichroic film meets the printing requirements. When the output field density meets the printing requirements, such as the field output density of newspaper printing is greater than or equal to 3.5, there is no need to adjust. Because the output density of the laser imagesetter and development conditions are unchanged, the output density of the film is determined. Therefore, only one of the color plates needs to be tested when testing the solid density of the output film. The four color versions of the separation are tested at the same time. In general, we use the black version for testing. For the specific operation method of using the Founder Century RIP output software and using the Japanese screen 5055 laser imagesetter to output the field density test and adjustment of the film, we can follow the steps described below. â‘ Firstly, in the current state, select a parameter template that has been made and needs to be adjusted in the "parameter template" command in the "rasterization" menu in the Founder Century RIP output software. â‘¡ Then click the "modify" button, you can enter the "modify" window of the parameter template and select the "parameter" command button, you can also enter the "option" parameter setting window, select the "grayscale conversion" button command in this window, You can enter the "Grayscale Conversion" parameter setting window, in which you can complete the linearization operation of the main laser imagesetter. â‘¢ In the "Grayscale Conversion" parameter setting window, you only need to select the "Black (Gray) Version" option without any modification, and select the "Test Results" button command to output the results. â‘£ After clicking the "Test Results" button command, four color output files will be generated in the "Job Monitor" window in the RIP output software, because only "" is selected in the "Grayscale Conversion" parameter setting window "Black (gray) version" option, therefore, there is no specific test result content in the three color versions of C, M, and Y, only the test result content in the K color version (but all four will be included in the K color version). Screen dot information in the color version), the content of the test results in the K color version can be output as a film after being connected to the screen 5055 laser imagesetter. [NextPage] ⑤ The next step is to test the solid density value of the 100% dot block in the output film. The general tool used to test the field density value of the output film is the density meter. At present, there are many types of density meters, and their functions are also different. Function, and must have a high test accuracy. The method of testing the solid density value of the output film is very simple, just adjust the density meter to the function of testing the density value, and test the solid density value of each color block in the output film. In the absence of any adjustments to the RIP output software and laser imagesetter, if the test results of the field density value of the output film can meet the printing requirements, it means that the parameters of the current RIP software and the imagesetter are in line with the current For printing requirements, there is no need to adjust some related parameters. You can directly test the dot percentage value of the output film, and set the "grayscale conversion" parameter in the RIP software to ensure that the design The percentage value of the dots of each color block when printing the layout is consistent with the percentage value of the dots of each color block during the actual output of the imagesetter. If the test result of the solid density value of the output film cannot meet the printing requirements, the exposure value of the laser imagesetter and the concentration of the developing solution and fixing solution should be adjusted. For the case where the output field density value is too high, you can simply reduce the exposure value of the laser imagesetter according to the situation without changing the original developing solution and fixing solution concentration; for the case where the output field density value is too low, you should First, increase the concentration of the developing solution and fixing solution. After passing the method of outputting test film described above, output a film and use a density meter to test the density value. If the density value of the output film still cannot be increased to meet the printing requirements, Then increase the exposure value of the laser imagesetter, and then output the film and test the density value. After repeated adjustments of the concentration of the developing solution and the fixing solution and the exposure value of the laser imagesetter, you can obtain the printing requirements. Field density value. In the specific operation, the operation of changing the concentration of the developing solution and the fixing solution is relatively simple. If the concentration is too small, add the solution directly. If the concentration is too large, add the water directly. The method of adjusting the exposure value of the laser imagesetter depends on different products, and the operation method is different. The adjustment method of the exposure value of the screen 5055 laser imagesetter is: when the imagesetter is started, enter the menu selection interface by using the "MENU" button on the operation panel; then select the "LASER" menu by using the "→" button and press " ENT "button to enter the menu window, the information displayed in the menu window is" LASER (12, 200) EXP "; where the value" 12 "indicates the output resolution is 1200DPI, the value" 200 "indicates the exposure value, exposure value The larger the field density value of the output film, the darker the graphic information output on the film. The maximum exposure value of the screen 5055 laser imagesetter can be set to 300; "LASER (12, 200) EXP" information indicates In the current state, for the film output using the output resolution of 1200DPI in the RIP setting, the exposure value when the laser scans the film is 200; if the output resolution used in the RIP is 1500DPI, it should be displayed In the "LASER (12,200) EXP" information window, change the value "12" to the value "15" by using the "→" and "â†" buttons, and then use the "ENT" Button to move the modification cursor below the value "200", you can modify the exposure value by using the "→" and "â†" buttons; after the exposure value modification is completed, you can exit and save by using the "MENU" button Setting; when modifying the exposure value, the exposure value should be gradually increased from low to high for testing. The exposure value of the imagesetter should be adjusted to the minimum value, but the density value of the output film can be guaranteed to meet the printing requirements; , When modifying the exposure value of the imagesetter, first be sure to confirm the output resolution in the RIP setting parameters. Only if the output resolution set in the RIP is exactly the same as the output resolution set in the imagesetter, The modification of the exposure value will take effect. According to the actual printing needs, after repeating the above steps many times, as long as the equipment and raw materials used are no problem, the solid density of the output film can reach the standard. [NextPage] Second, the test and adjustment of the output film dot percentage It is often the case that linearization is equivalent to testing and adjusting the percentage of the output film dots. This view is actually not complete, but only one aspect of the linearization operation of the imagesetter is mentioned, but it does not include the content of the output film's solid density. On the basis of the correct output of the film's solid density, the test adjusts the dot value of the output film to be consistent with the dot percentage value of the corresponding color block that is available in the pre-press design and production or is artificially set, which determines the color of the original. The key to getting prints truly restored. It is one of the important operations to prevent the printed products from being cast or not full of color. The main operation for testing and adjusting the percentage value of the output film dots is generally to reset the relevant output parameters of the RIP software, and also need to use a density meter to test the percentage value of the dots in each color block in the output film. The operation link is less than that of the output film field density test and the adjustment operation link, and the operation is much more convenient, but before testing and adjusting the percentage value of the film dot, it must be ensured that the film density value has reached Printing requirements. For the specific operation method of testing and adjusting the percentage value of the film dot output using the Founder Century RIP output software and the Japanese screen 5055 laser imagesetter, the main operations are the "Grayscale Conversion" parameter setting window introduced earlier Completed in, we can follow the steps described below. â‘ Under the condition that the density value of the output film has reached the printing requirements, select a parameter template that needs to be adjusted in the "parameter template" command in the "rasterization" menu in the Founder Century RIP output software; then click " "Modify" button, you can enter the "Modify" window of the parameter template, then select the "Parameter" command button, enter the "Options" parameter setting window, select the "Grayscale Conversion" button command in this window, you can enter " "Grayscale conversion" parameter setting window, the next operation is mainly done in this window. â‘¡ In the "Grayscale Conversion" parameter setting window, select the "black (gray) version" option in the current state, and select the "test result" button command to output the result, at this time in the "job monitor" in the RIP output software "The output file of four color versions is generated in the window, but only the K color version includes the dot block information test result content of all four color versions. The test result content in the K color version is the same as the screen 5055. The laser imagesetter will output it as a film after being online. â‘¢ Test the output four-color halftone dot film on the density meter using the halftone dot value test function. At this time, two operators are required to operate at the same time. An operator reports the corresponding value tested from the 0% to 100% halftone block in the C, M, Y, K four-color version on the film to the operator in the RIP output software, who is using the RIP output software. The operator should fill in the value reported by the test operator in the corresponding modification table in the "Grayscale Conversion" parameter setting window in the corresponding modification table or modify the original value into the test The value obtained. At this time, the percentage values ​​corresponding to the film measured by using the density meter on each color plate may not be consistent, for example, the value measured by the dot block of 70% in the black (gray) color plate is 74% , The measured values ​​of the dot blocks corresponding to different percentage values ​​in other color blocks will also be different, which indicates that the linearization operation of the imagesetter currently used has not yet reached the standard. For example, in the 70% option box in the black (gray) color version, if the original value is 70%, 70% of the dot blocks in the black (gray) color version of the output film use the value measured by the densitometer if If it is 74%, you should change the original 70% value to 74% in the 70% option in the modification table of the black (gray) color version. The method of modifying the percentage value corresponding to any one dot block in any other color version in the table is also tested and modified until all values ​​from 0% to 100% of all four color versions are tested and modified. The conversion operation process of the gray curve is completed. [NextPage] It should be noted that the values ​​corresponding to the halftone blocks in the four color versions of C, M, Y, and K are tested and corrected. The grayscale conversion curves of all color versions after the final test and correction should be a curve close to a straight line. , There should not be very obvious inflection points or curved line segments in the curve. If there are very obvious inflection points or curved line segments, it means that the linearization of the imagesetter itself is very poor. The usual processing method is to directly bend the inflection point or the curve Straighten the line. â‘£When the values ​​corresponding to the dot blocks in the four color versions of C, M, Y, and K are all tested and corrected, you can click the "Save to Public Data" button in the "Grayscale Conversion" parameter setting window, The system saves the currently defined grayscale conversion curve to public data to make it the current public grayscale conversion curve; its saved path is "c: \ ProgramFiles \ FOUNDER \ PSPNT21 \ Color". For using different parameter templates The gray scale conversion curve should be saved with different names. The naming principle can be distinguished according to the parameter templates with different resolutions output, that is, if the parameter templates with the same output resolution are used in the output film, they can be shared The same grayscale conversion curve that has been corrected, for example, the grayscale conversion curve using 1500DPI output resolution can be named "1500 grayscale curve.cuv": For the saved grayscale conversion curve, you can "Click the" Load from public data "button in the parameter setting window to call the required grayscale conversion curve in the path of unified storage; The grayscale conversion curve that has been corrected can be output as a PS file by clicking the "Test Results" button in the "Grayscale Conversion" parameter setting window, and you can use the imagesetter output in the "Job Monitor" window of the RIP software. film. At this time, the dot blocks in the four color versions of C, M, Y, and K that are output can also be used again for the verification test with the dot percentage test function on the density meter. If the grayscale conversion curve has been completely corrected After that, the percentage value of the halftone dots tested again should be one-to-one corresponding to the corresponding percentage values ​​of the halftone dots in the four color versions of C, M, Y, and K on the output film, and their percentage values ​​should be exactly the same of. If there is inconsistency or a part of the percentage value is inconsistent, then use the previous step â‘¢ and step â‘£ to re-modify until the measured percentage value is completely consistent with the corresponding percentage value on the output film, you can be sure the linearization of the imagesetter The operation has been completed. In the two aspects of the above-mentioned test and adjustment of the output film solid density and the output film dot percentage value, through the use of special testing equipment combined with RIP software and laser photocomposing machine parameter adjustment, you can compare Accurately complete the linearization operation process of the imagesetter. In actual work, the density and dot percentage of the output film should be checked regularly, and some parameters can be adjusted when an error occurs. In addition, the use of relatively fixed imagesetter supplies is also an important aspect of ensuring output quality. PC/ABS alloy is a lighter and thinner material of engineering plastics with better comprehensive performance.It has the most flexibility and the most resistance to impact and impact resistance. It has good heat resistance and cold resistance. It is not a problem to encounter rain when traveling. Waterproof and oil proof are all characteristics. 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Linearization operation method of imagesetter