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. ①Under 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. ② 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. ③ 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 a density meter on each color plate may not be consistent, for example, the value measured by the 70% dot block 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 dots 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. 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. ④When 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 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 with a well corrected gradation conversion curve, for example, using the output resolution 1500DPI gradation conversion curve designated as "gradation curve 1500 .cuv": for good gray scale conversion curves can be stored in the "gradation conversion "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 corrected grayscale conversion curve 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 ③ and step ④ 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.
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