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Scanning and imaging techniques in platemaking

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Scanning and imaging techniques in platemaking

作者:成都印刷厂 点击:23 Release Date: 2017-09-07 Author: Chengdu printing Hits: 23

Scanning and imaging techniques in platemaking

Platform-type desktop scanning settings are currently commonly seen as objects competing with ancient drum scanners. From a different perspective, the difference has moved to productivity, image size and the poorest resolution indicators. In addition, there are also poor The quantity attribute will influence the decision to purchase.

Resolution is the criterion of scanner quality. When evaluating correctly, it is important to compare the optical resolution or machine resolution of each setting. Manufacturers usually use the poorest interpolation resolution, and the supplementary pixels are actually The "creation" method is used to supplement the resolution that the sensor can obtain. The abnormality of other resolutions depends on the design of the setting. The poorest resolution does not support all scanning areas. The use of lenses can reduce the usefulness of poorer manuscripts. The size, to conform to the size of the CCD array, so also reduces the poorest scanning resolution.

The dynamic boundary is a measurement of the logarithmic value of the sensitivity of the scanning sensor, especially in the dark area. The product specifications can be given in terms of Dmax or dynamic boundary. The starting point may not be 0.0, so Dmax can be poorer than this boundary. Values. In all circumstances, the higher the number, the better the quality of the scanner. The Dmax of 3.0 is the low-end criterion of focusing on the scanner, and the Dmax of 4.0 represents the high-end setting. This number should be in the dark part of the sensor. The fine work is regarded as the black reading point.

The colorful depth is another indicator of the image quality of the scanner. The final image may be input with 8 bits per color (RGB public 24 bits), but perhaps the poorer colorful depth (10, 12, 14 or 16) It is declared that the better quality can be obtained, and the poorer the color depth, the more the chance for the control staff to know how to sample the data, so the manipulation of the final picture is also added.

The area where the image is scanned has a clear influence on the decision to purchase. It is important to know that some scanners, especially low-end scanners, use additional file input to obtain the poorer scanned image areas, while the area of all scan boards is only 8.5. X11 inches.

The drum-type photomultiplier tube type and the flat-panel CCD type were thought to be the measurement points between scanning quality and easy maneuverability in the past. Skills catch up with the poor to reduce this gap. However, usually still think that the drum type is in high resolution Competitive scanning application software, especially the poor-format manuscripts. In addition, offline assembly and setting, poorer image areas for batch scanning, hardware assistant solutions, etc. are also the reasons for the high productivity of the drum type .

RGB to CMYK alternation is also an element of the decision to purchase, especially the scanners that are suitable for a limited number of production sites. High-end settings are usually supplied by hardware solutions to provide instantaneous RGB to CMYK alternation. As a supplement, it is more beneficial to store pictures with RGB appearance or therefore and independent color space than using CMYK method.