HQ-510 RIP linearization adjustment method

figure 2

It should be noted in this interface that "Print uncalibrated target" means outputting unadjusted curves, and "Print calibrated target" means outputting adjusted curves. When doing linearity for the first time, first select the accuracy that needs to be output in the box under "From Page Setup (s)" (that is, the accuracy determined in the page setup), and then choose to output the unadjusted curve (Print uncalibrated target) . The linearization test strip of the following figure will be output in the imagesetter. Use a transmission densitometer to measure the actual dot percentage in the box below each displayed value and record it. (The "Uncalibrated Target for device '5055': uncalibrated" line at the top of the test bar indicates that the test bar is output from the device driver name "5055", and the linearized data has not been adjusted; the lower part of the text indicates the output Accuracy, line number, dot angle, dot shape; "Max / Min" and the black and white box below are solid and blank parts. Before measuring the dot percentage, use these two boxes to measure the solid density and clear the density meter on the film ; The middle of the film is the area that needs to measure the percentage of dots. The number of 0.0-100.0 is the value of the percentage of dots that the dots should reach. The area with dots below is the density meter measurement area.)

Click the "Calibration Manager" menu under the menu "Output" (see Figure 1 for the location), and the interface shown in Figure 3 will appear on the screen.

image 3
There is no option available in dialog box 1 when doing linearization for the first time. You need to press the "New" button to create a new one. Before pressing, first check whether the "Device" item is placed on the phototypesetter you built (how to create a "Device" will be discussed in a future article). The selection of the "Color Space" item is based on the RIP Medium color separation is determined by color separation in hair development software (generally no color separation is needed in RIP, color separation can be done in hair development software, this item is also selected in page settings, refer to the settings in it) , The linearization data used by the two are different. Take the color separation in the layout software as an example, select "Monochrome" in the "Color Space" section, and click "New" to display the following interface: Figure 4.

In this interface, "Resolution" indicates the required accuracy, which must be consistent with the accuracy in the page settings made earlier. "Vertical" indicates the vertical direction, and "Horizontal" indicates the horizontal direction. There is no special requirement that the accuracy in both directions should be the same. "Dot shape" table dot shape, this option should also be consistent with the previous page settings. The number of screen lines corresponding to the selected precision in the "Screen freq" table is generally: 1200dpi corresponds to 75-100lpi, 2400dpi corresponds to 106.4-180lpi, and 3000dpi corresponds to 120-205lpi. When the precision of 3000dpi needs to output 100lpi lines, it is different from the linearization data used for the above lines, and it needs to be done separately. The "Use for Pos & Neg" table applies this linearized data to both negative and positive films. Although this item is selected, it has been mentioned above that in actual use, the same linearized data cannot be used for negative films. "Name" is to name this linearized data, the principle of naming is: try not to use Chinese; the name should be easy to identify and understand. It can be named as follows: precision-dot shape-film brand, such as AGFA film, 2400dpi linear square dot linearization data can be named: 2400-Eud-AGFA. "Channel" table output monochrome or four colors, just select "Gray" (grayscale). The "Measurements as" table appears as a negative or positive film during measurement. Generally, "Positive% Dot" is selected as the positive dot. "Negative media table uses negative film. This item will only be used when adjusting the linearization of negative film." Force Solid Colors "select this item to use this linearization data for spot colors.
The values ​​from 0.0 to 100.0 appearing at the bottom of these menus correspond to the percentage of dots from 0% to 100% in the linearization test strip, and the actual percentage of dots measured from the linearization test strip correspondingly enter into the box below , In the bottom row of buttons on the interface, "Smooth" is smooth. After the curve adjustment is completed, press this button to make the dot compensation more smooth (you need to press this button after all data is entered); the "Clear" table will Input value is cleared; "Reset" is reset; "Import" is input (basically not used for this item).
After setting this interface, press "OK" to exit the interface shown in Figure 4 and return to the interface shown in Figure 3. The linearized data just named appears in the dialog box 1. In the box, "Name" table linearized data name; "Resolution" table linearized data accuracy; "Dot" table linearized data dot shape; "Freq" table linearized data control line number; "+/- ”Indicates whether the linearized data is also suitable for Yin and Yang films;“ Status ”indicates whether the linearized data has been adjusted and used, showing“ D ”indicates that the linearized data has not been adjusted, and“ E ”indicates that the linearized data has been adjusted. After being adjusted, "U" indicates that the linearized data has been adjusted and used. After checking the correctness, click "OK" to complete the linearization data setting and exit the interface shown in Figure 3. At this time, it is necessary to check the linearized data. Then open the interface shown in Figure 2 and select the precision just now. This time you need to select the output adjusted curve (Print calibrated target) and the phototyper output linearization test strip (the upper line of text becomes "Calibrated Target for device '5055': "calibrated" indicates that the linearization test strip has been adjusted). Use a density meter to measure the percentage of the dots output this time. The difference between the actual measured value and the value displayed in each column of the linearization test strip can be between 1% and 2%.
In the interface shown in Fig. 3, "Edit from uncalibrated target" means editing the curve without adjustment, and "Edit from calibrated target" means editing the curve after adjustment. The choice of these two items is corresponding to whether the linearization test strip is a corrected curve. When performing linearization correction for the first time, select "Print uncalibrated target" in the interface shown in Figure 2 (output unadjusted curve). After the linearization test strip is output, you need to click "Edit" in the interface shown in Figure 3 "from uncalibrated target" (edit unadjusted curve); and select "Print calibrated target" (output adjusted curve) when outputting again, after the linearized test strip is output, if the actual measurement value of the dot percentage and the linearized test strip There is a large error in the displayed value in each column. You need to click "Edit from calibrated target" to edit the data again. Click "Edit from calibrated target" (Edit adjusted curve), the interface appears the same as the interface shown in Figure 4, the editing method is also the same as the method described above, both input the measured data into the box, click "Smooth" button New Zealand completes the re-editing work. Then repeat the above work until you are satisfied. Under normal circumstances, HQ RIP only needs to edit "Edit from uncalibrated target" once (edit unadjusted curve), and once "Edit from calibrated target" (edit adjusted curve) can get good linearization data.
In addition, when replacing films of different brands, it is necessary to start with the output of the uncorrected curve, and when replacing the developer liquid or adjusting the linearization curve every day, you only need to start with the output of the corrected curve. The HQ-310 RIP linearization adjustment is basically the same as the HQ-510 RIP, which can be done by referring to the above steps and interface.