Second, the dot gain compensation correction 1, through the color separation parameter settings, compensation dot gain 2, the standard dot gain value and dot gain curve correspond to different ink and paper combinations, PHOTOSHOP built a standard set of Dot increase parameters. How easy it is to increase the dot setting? The simple method is to set the default midtone dot gain value for each combination of ink and paper. These values ​​are the empirical figures after long-term use and have certain guidance for production practice. significance. For example, the default value of WSOP(COATED) is 20%, the default value of SWOP(UnCOATED) is 25%, and the default value of SWOP(NEWSPRInT) is 30%. In PHOTOSHOP, each ink-paper combination has an estimate of the increase in the midtone dots for each color version. The software uses this value to create a dot-enhancement curve for each color version, and to perform dot gain adjustments for the entire image. Such dot gain curves are called standard dot gain curves, which are provided by software, as shown in FIG. 2 .
(A) Cyan dot gain curve (B) Yellow, magenta, black dot gain curve diagram 2 (slightly) When the midtone dot gain value is 20%, the dots of each color version increase the curve for the same type. Output device, the need to modify the main point is to increase the value obtained by the actual use of the situation, rather than change the type of ink. There are different dot gain rules for different types of output devices. For example, black-and-white laser printers have dot gains that are much higher than those of offset presses, where the halftone dot gain is usually around 35%, and inkjet printer dots are lower. The dot gain for non-POSTscript laser printers or other printers cannot be controlled by color separation parameters, but it is very important to try to control the dot gain value to obtain the correct image output.
3. Set up the dot gain curve automatically from the midtone dot increase value. If the user uses the ink paper combination in the PHOTOSHOP Ink COlORS menu, but the midtone dot gain is different, you can enter the actual midtone dots in the DOTGAIn box. To increase the value, the software automatically creates a dot gain curve using the midtone dot gain value input by the user as the standard value.
4. Customized dot gain curve If the user is not satisfied with the software's default standard curve, you can customize the dot gain curve, that is, select Curvex from the DOT GAIn menu, specify the dot gain value of each of the 13 points, and other positions. The dot gain value is still generated automatically by the software.
5. CuRVES tool compensation dot gain The direct and correct method of changing the data in the image is the quickest and easiest method to correct the data in the image using the CuRVES tool in PHOTOSHOP. Similarly, the scan acquisition curve can be set using a similar tool in the front-end scanning software. Compensated data. The compensation method is shown in Figure 3. If the dot is increased by 10%, a control point is set on the 50% point on the tone curve, and the point is adjusted to the 40% tone, so that the scanned and processed image looks brighter than the original picture when the tone is intermediate. Some, but when printing (or printing), 40% of the dots will darken to 50%, just like the original. (to be continued)
(A) Cyan dot gain curve (B) Yellow, magenta, black dot gain curve diagram 2 (slightly) When the midtone dot gain value is 20%, the dots of each color version increase the curve for the same type. Output device, the need to modify the main point is to increase the value obtained by the actual use of the situation, rather than change the type of ink. There are different dot gain rules for different types of output devices. For example, black-and-white laser printers have dot gains that are much higher than those of offset presses, where the halftone dot gain is usually around 35%, and inkjet printer dots are lower. The dot gain for non-POSTscript laser printers or other printers cannot be controlled by color separation parameters, but it is very important to try to control the dot gain value to obtain the correct image output.
3. Set up the dot gain curve automatically from the midtone dot increase value. If the user uses the ink paper combination in the PHOTOSHOP Ink COlORS menu, but the midtone dot gain is different, you can enter the actual midtone dots in the DOTGAIn box. To increase the value, the software automatically creates a dot gain curve using the midtone dot gain value input by the user as the standard value.
4. Customized dot gain curve If the user is not satisfied with the software's default standard curve, you can customize the dot gain curve, that is, select Curvex from the DOT GAIn menu, specify the dot gain value of each of the 13 points, and other positions. The dot gain value is still generated automatically by the software.
5. CuRVES tool compensation dot gain The direct and correct method of changing the data in the image is the quickest and easiest method to correct the data in the image using the CuRVES tool in PHOTOSHOP. Similarly, the scan acquisition curve can be set using a similar tool in the front-end scanning software. Compensated data. The compensation method is shown in Figure 3. If the dot is increased by 10%, a control point is set on the 50% point on the tone curve, and the point is adjusted to the 40% tone, so that the scanned and processed image looks brighter than the original picture when the tone is intermediate. Some, but when printing (or printing), 40% of the dots will darken to 50%, just like the original. (to be continued)
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