How to maintain image accuracy in the most popular

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How to maintain image accuracy in large format color output

to obtain high-quality output effect in large format color output, we must pay attention to the quality of source files. There are two main ways to obtain source files. First, it is obtained by scanning materials. At this time, the performance of scanning equipment has a decisive impact on the quality of generated files. Different devices scan the same material to get different file quality. Another way to get the source image is to select it directly from the ready-made electronic image library. At this time, users cannot choose the accuracy of the source image

You need to browse the user manual of the configuration in detail

theoretically, 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 1010cm photo needs to be enlarged to 100cm and output with 720dpi, the photo should be scanned with 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 obvious graininess, which will affect the surface quality of those who draw opposite methods and regulations. If it is too large, the file will be too large, affecting the drawing speed

in the actual use process, users usually encounter such a problem. When scanning a photo, the scanning accuracy needs to exceed the mechanical resolution of the scanner. At this time, users only need the highest mechanical resolution of the scanner to scan the whole photo, rather than using the software interpolation function of the scanner 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 greatest extent, and the scanning time is shorter. Users can perform image processing at a faster speed, but before output or when necessary, they can improve the file accuracy by using the interpolation algorithm in the image processing software. If RIP software has anti aliasing function, it is best to turn it on. Example: 1010cm photos need to be scanned at 1800dpi, and the mechanical resolution of the scanner is 600dpi. At this time, scan with 600dpi accuracy, so that the file generated by scanning is much smaller. On this basis, the speed of image processing is much faster than that of processing 1800dpi images. Improve the accuracy of the document before adding text or printout

in order to obtain better scanning effect, higher quality materials are required. The order of scanning quality of different types of materials is color positives, photos, and prints. For color negatives, it is best not to use them for non professionals because they involve color restoration. Among them, printed matter is the most common, and the key to scanning printed matter is to select good parameters. Users can first compare different parameters with the materials that will cause pipeline damage after the 1980s when the operating stress exceeds the allowable stress of FRP materials, so as to find out the best parameters

note: the optical resolution of the scanner refers to the accuracy of the optical elements in the scanner. Mechanical resolution refers to the mechanical movement accuracy of the scanner, which is similar to hardware interpolation. Software resolution refers to the resolution that can be achieved by the scanning program using interpolation algorithm

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