Large format color map exquisite output tip
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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 the source file. One is obtained by scanning the material, and the performance of the scanning device has a decisive influence on the quality of the generated file. The quality of the files obtained by different devices scanning the same material is different. Another way to obtain the source map is to select it directly from the ready-made electronic photo library. At this time, the user cannot select the source map precision.
In theory, the accuracy of the source file should be no less than 1/4 of the output accuracy in the 1:1 case. For example, a 10X10cm photo should be enlarged to 100X100cm and output at 720dpi. At this time, 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 and affect the picture quality. If it is too large, it will cause the file to be too large, which will affect the speed of drawing.
In actual use, users often encounter such a problem that when scanning a photo, the accuracy of scanning needs to exceed the mechanical resolution of the scanner. At this point, the user only needs to scan the entire photo with the scanner's highest mechanical resolution, instead of using the software interpolation function of the scanner to improve the file accuracy. This has the advantage of generating smaller files, maximizing the effective information of the image, and having a shorter scan time. The user can perform the image processing at a faster speed, but the file accuracy is improved by using an interpolation algorithm in the image processing software before or when the output is needed. If the RIP software has anti-aliasing, it is best to turn it on. Example: 10X10cm photos need to be scanned at 1800dpi, and the scanner has a mechanical resolution of 600dpi. At this point, the scan should be performed with a precision of 600 dpi, so that the files generated by the scan are much smaller. On this basis, the image processing speed is much faster than processing the 1800 dpi image. Increase the file accuracy before adding text or printing output.
For better scanning results, higher quality materials are required. The scanning quality of different materials is in order of color positive film, photo, and print. For color negative film, it is best not to use it for non-professionals because it involves color reproduction. Among them, print is the most common, and the key to sweeping the print is to select the net parameters. The user can first compare the different parameters of the material to find the best parameters.
Note: The optical resolution of the scanner refers to the accuracy of the optics in the scanner. Mechanical resolution refers to the mechanical movement accuracy of the scanner, similar to hardware interpolation. Software resolution is the resolution that the scanner can achieve using interpolation algorithms.