How to maintain image accuracy in large-format color output. To obtain high-quality output in large-format color output, you must pay attention to the source file quality. There are two main ways to obtain source files. First, it is obtained by scanning materials. At this time, the performance of the scanning device has a decisive influence on the quality of the generated files. The quality of the files obtained by different devices scanning the same material is different. Another method to obtain the source image is to directly select it from the ready-made electronic picture library. At this time, the user cannot select the source image accuracy.
Theoretically speaking, the accuracy of the source file should be no less than 1/4 of the output accuracy in the case of 1: 1. If a 10X10cm photo is enlarged to 100X100cm and output at 720dpi, the photo should be scanned at a resolution of not less than 1800dpi (calculation formula: source file dpi = magnification factor X (output dpi / 4)).
If the accuracy of the source file is less than 1/4, the image will appear more grainy, which will affect the picture quality. If it is too large, it will cause the file to be too large and affect the drawing speed.
In actual use, users often encounter such a problem. When a photo is to be scanned, the scanning accuracy needs to exceed the mechanical resolution of the scanner. At this time, the user only needs to use the scanner's highest mechanical resolution to scan the entire photo, instead of using the scanner's software interpolation function to improve the file accuracy. The advantage of this is that the generated file is smaller, the effective information of the image is obtained to the maximum extent, and the scanning time is shorter. The user can proceed at a faster speed during image processing, but the interpolation accuracy in the image processing software is used to improve the file accuracy before output or when needed. If the RIP software has anti-aliasing, it is best to open it. Example: A 10X10cm photo needs to be scanned at 1800dpi and the mechanical resolution of the scanner is 600dpi. At this time, the scanning should be performed with an accuracy of 600dpi, so that the file generated by the scanning is much smaller. On this basis, the image processing speed is much faster than processing 1800dpi images. Before adding text or printing out, increase the file accuracy.
To get better scanning results, you need higher quality materials. The scanning quality order of different types of materials is color positive film, photo, and printed matter in order. For color negative film, it is best not to use it for non-professionals because of the problem of color reproduction. Among them, the printed matter is the most common, the key to scanning the printed matter is to choose the parameters of the screen. The user can first compare the material with different parameters to find the best parameter.
Note: The optical resolution of the scanner refers to the accuracy of the optical components in the scanner. Mechanical resolution refers to the accuracy of the scanner's mechanical movement, similar to hardware interpolation. Software resolution refers to the resolution that a scanning program can achieve using interpolation algorithms.
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