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阳台壁挂太阳能热水器的缺点
来源:http://www.sdlntyn.com 发布时间:2018-9-4 17:16:56 浏览次数:377
丝网印刷双色调印刷还减少了套印中的纹理外观,它一方面减小了半色调网点图案,另一方面扩大了可复制色调的范围。使用六色印刷,粗糙的半色调会显得不那么粗糙,50线/英寸的半色调看起来像是100线/英寸,65线/英寸看起来像是120线/英寸或更好。

Two-tone screen printing also reduces the appearance of the texture in overprinting, which on the one hand reduces the halftone dot pattern, on the other hand, expands the range of reproducible tones. With six-color printing, rough halftone will look less rough, 50-line/inch halftone will look like 100 lines/inch, 65 lines/inch will look like 120 lines/inch or better.

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使用青和品红的双色调进行印刷还扩大了所复制图像的动态范围。动态范围是更亮区域和更暗区域之间的差值。简单地说,它使得暗调的更暗,亮调更亮。
The use of green and magenta in dual tone printing also expands the dynamic range of the copied images. The dynamic range is the difference between the brightest and the darkest regions. In short, it makes darkened and brighter tones.
大多数印刷有一个不小于2.0的更大动态范围。在丝网印刷中很少能够达到这个标准,一般来说是在1.6-1.8之间。一个2.0的动态范围意味着1%的亮网点可以得到还原,复制出的墨色可以吸收99%的光,只反射1%的光(与此相比,丝网印刷的黑只能落在97.5%-98.4%)。
Most printing has a maximum dynamic range of not less than 2. This standard is rarely achieved in screen printing, and generally it is between 1.6-1.8. A dynamic range of 2.0 means that 1% of the bright dots can be restored, and the duplicated ink absorbs 99% of the light and reflects only 1% of the light (compared with 97.5% - 98.4% of the screen-printed black).
但是人眼的动态感光范围可达到4.0以上(1/10000的光可感觉,或者99.99%黑可感觉)。丝网印刷这是为什么在可视世界中能看到暗调的细节,而在印刷中无法实现的原因。用双色调颜色模式,我们可以把所印刷的动态范围增加到2.2(99.4%的黑)。这看起来好象不是一个什么大事,但是我们能看出所得到黑色的层次比用四色套印所获得的层次要好。
But the dynamic range of light sensitivity of the human eye can reach more than 4.0 (1/10000 light sensible, or 99.99% black sensible). Screen printing is the reason why dark details can be seen in the visual world, but not in printing. With two tone color mode, we can increase the dynamic range of printing to 2.2 (99.4% black). It doesn't seem like a big deal, but we can see that the black layer is better than the four-color overprint.