| [印刷知识]关于菲林、网线和网角等印前知识 |
| 添加时间：2017/12/15 14:34:09 浏览次数： |
| 菲林和你平时拍摄黑白照片、X光时拿到的底片、X光片差不多，只不过菲林是挂了网的，也就是底片X光片是连续影调，菲林的影调是由不同大小的点来组成的。印刷用的菲林大多由CMYK四张(专色：每一色一张)，也就是我们PS在CMYK的各通道里面所见到的影调。 Do you usually take black and white photos and film, X film, X get the light ray almost, but the film is linked to the network, or negative X ray film is continuous tone, tone is different from the size of the point to. Printing films used mostly by CMYK four (a spot color: each color), what we see in the PS channel of the CMYK inside the tone. 网线——通常指输出菲林时每平方英寸要挂网的数量，我们常用的有175目和200目。 Network line - usually refers to the number of nets per square inch to be suspended for the output of the field. We usually have 175 eyes and 200 eyes. 我们在用的网线大都是调幅网，也就是网点中心点的间距是一样。还有一种是调频网，调频网是RIP挂网时按影调的深浅不同来分配网点间距离和大小。 Most of the net lines we use are amplitude modulation networks, that is, the distance between the center points of the dot is the same. There is a FM, FM network RIP net according to the tone of different shades to the distance between the size and distribution outlets. 我们常用的是菱形网点、圆形网点。还有是线形的、椭圆形的等。 We often use rhombus dots and circular dots. There are also linear, oval, etc. 按不同的印刷要求所挂网目数也不一样。目数越高对印刷机及PS版等印刷材料的要求越高，印出来的印品质量也就越好。 According to the different printing requirements of the net mesh size is not the same. The higher the mesh printing machine and other printing materials PS version of the higher requirements, the printed printing quality is better. 用高目数的菲林在低质量的机器上印会发生并网现象，也就是90%左右密度(暗部层次)部分会连成一片(变成实地)，这样印品暗部也就损失了层次。 With high mesh film in the low quality of the printing machine will happen grid phenomenon, which is about 90% density (black level) will form a (into the field), this print shadows also lost levels. 网角——就是网点的排列方向。我们常用的网角是C15度、M75度、Y0度、K45度。网角的合理排列是经过许多先人实践后总结出来的，网角这间的角度要大于20度以上，这样才不会出现撞网现象。平时只有在印品中出现龟纹之类问题时才去调整网角。 Net angle - is the direction of the network. Our common net angle is C15 degree, M75 degree, Y0 degree, K45 degree. The reasonable arrangement of the net angle is summed up by many ancestors, and the angle of the net angle is more than 20 degrees, so that there will not be the phenomenon of hitting the net. Usually only appear in print in moire problems such as to adjust the screen angle. 另外一点非常重要，好多朋友以为在PS里面的精度越高印品就会越好。其实这是个错误的认识。印品的好坏不完全取决图片的精度，而是在印刷工艺的每一道环节。精度只要能达到要求就够了。 Another point is very important. A lot of friends think that the higher the accuracy in PS, the better the better. In fact, this is a wrong understanding. The quality of the print does not depend entirely on the accuracy of the picture, but in every link of the printing process. The precision is enough as long as it can meet the requirements. 最合理的PS精度，就印品而言是挂网目数的1.5----2倍。还有一种是新手不太熟悉的，就是激光照排机的精度(输出精度)和你所做的PS精度的关系。绝大部分输出公司激光照排机输出精度是2400DPI，而同一台机子有1200---3600DPI不同档数，输出精度越高，输出的网点边缘也就越好(俗话称光滑)速度也就越慢。 The most reasonable accuracy is PS, the printing is 1.5----2 times the net mesh size. One is not familiar to the novice, which is the relationship between the precision of the laser phototypesetting machine (output precision) and the PS precision that you do. Most of the output laser phototypesetting machine output accuracy is 2400DPI, and the same machine has 1200---3600DPI different files. The higher the output precision, the better the output dot edge is. The slower the speed is. 为什么激光照排机有那么高的精度输出而我们PS里面只要300--400DPI就够了呢?这里向大家说明一点：你文件里面所做的1个像素激光照排机可生成8个像素，也就是1：8。这下你可自己算一下你所要做的图片精度应该是多少了。前提是激光照排机是2400DPI输出的，2400÷8=300本人建议用350DPI挂175线网目是没问题的，挂200目用350--400DPI(但激光照排机输出最好用3600DPI，输出中心会用这个输出吗)。 Why does the laser phototypesetting machine have such high precision output, and we only need 300--400DPI in the PS? Here's a note to you: the 1 pixel laser phototypesetting machine in your document can generate 8 pixels, that is, 1:8. In this case, you can calculate the accuracy of the picture you want to do. The premise is the laser phototypesetting machine is the output of 2400DPI, 2400 8=300, I suggest using 350DPI 175 hanging wire mesh is no problem, hanging 200 orders with 350--400DPI (but imagesetter output by 3600DPI, the output center will use the output of it). 还有一点，墨点的溢出，也就是铺出。像我们盖图章一样，印重了印泥在四周会铺出来(比实际稍大一点)。印刷墨点也有这样现象，以本人经验在我们印前不需过份强调这点，有关这方面的因素有好多，如晒版晒过了或洗版洗过了点子就会小点，印机的垫衬过厚或压印的力过大点子就会大些。这些因素印刷厂的师傅会按你所做的打样稿来调整的。你也控制不了。 Another point, the ink point spillover, that is, spread out. We like the same stamp, printed on heavy inkpad around will be spread out (a little larger than the actual). Printing ink spots also have such a phenomenon. With my experience, we need not emphasize this point too much before printing. There are many factors related to it. For example, printing or drying or washing the printing plates will be smaller. The thickening or stamping force of printing machine will be greater. These factors in the printing factory will be adjusted according to the draft you made. You can't control it. 我们印前所要做的是每个活件出来后都要拿过来自己看一下，和屏幕对照一下，测下数值，有多少差距，有没有达到了你先前设计时的要求?你做的产品是50%红，打样或印品有没有50%的值，和你的期望值差多少?如果打样或印品和你电脑里面的数值非常接近，效果又不好的话是你显示器或是你看颜色的经验问题了。不要依赖显示器，要学会用数值。 We have to do is press each job after all to take over their own look, and screen control, numerical test, the number of gap, have not reached your previous design requirements? You do product is 50% red, proofing or printing have a value of 50%, and you the expected value of difference? If the numerical proofing or prints and your computer are very close, the effect is not good for you or you see display color of the experience. Don't rely on the monitor, and learn to use the value. |
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