The note before pressworking
Should know before output
One. Why screen of publication use half-tone and color color separation?
Because printing machine puts in two confine:
- - printing machine can imprint only pure lubricious and cannot imprint tonal
- - printing machine can use printing ink of a kind of color on paper only every time. The success of publication pressworks will two elements decide. Because presswork,be to include tonal picture (call successive and tonal image) . And printing machine pressworks only simple look. Want to solve this problem to involve use bit to establish the image with tonal imitate. These image call half-tone image. A variety of colorific image presswork on the printing machine that the 2nd problem involves the printing ink that uses a kind of color only every time. Every kinds of printing ink must apply independently, accordingly, must be through founding color color separation to depart image its are basic hue.
2. What calls half-tone image? Half-tone image is comprised by the dot. Include the changeover before tonal image is pressworking to be half-tone image.
3. Why cannot printing machine imprint outstanding mix?
Be conveyed to make up when image move presswork on edition when, image area (presswork what printing ink transmits a page plate making part) can suck Chinese ink through chemical processing and repellent water. Processing of course of blame image area is OK and bibulous and repellent Chinese ink pressworks when printing ink course when edition. Printing ink adheres to only in image area, should presswork when edition and paper are contacted, only the page part that contacts with image area is imprinted to go up printing ink, its defect is: Lack administrative levels gradual change. Means of settlement: The picture that forms by bit through pressworking will found psychedelic and tonal. So, how is ability finished will include the picture that bit forms for tonal image or successive and tonal image changeover. And finish this process to call half-tone screen.
4, what is screen line number and screen angle?
The aperture on half-tone screen is to press what arrange all right. Half-tone screen go up every inches the linage that the linage of aperture decided to form half-tone picture. Should be worth number of line of the screen that be called. With every inches of linage (LIP) will express. If half-tone screen point of view is same, so, presswork has clear cloth grain pattern. Edition of all every color separation must have different point of view.
5. What calls a number half-tone
Use the to resemble element bit that say to establish half-tone image. If every half-tone orders platoon aircraft,form by element of a few figurine. Each groups when form half-tone place call unit of a half-tone like element dot. 6. Is line of the biggest screen counted and nod gain? All half-tone drops that taller screen line figures image of the composition that contain place are reduced somewhat; Generation of lesser half-tone name a person for a particular job contains the brighter picture of more detail. But, screen line number has an use upper limit this limitation depends on the amount that predicts the point gain that produce. Should presswork on printing machine when publication, when printing ink is absorbed by paper, have a bit diffuse. Diffusing printing ink is contained nod for big half-tone very picture looks to want than what predict deep, this kind of effect calls bit of gain. Through proper electron color management or highlight image can make up for bit of gain to perhaps be used the paper that sucks Chinese ink not easily and. Use accurate printing machine, can increase number of line of the biggest screen thereby.
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