Rus Articles Journal

Whether you know about a lineature of

the Lineature is closely connected with other parameter which is not set in an explicit form but very important for quality of the image: with number of steps of graded transition. Many probably faced such regrettable phenomenon when the nice gradient created in any raster editor on the screen looks smooth, but on the press gains unpleasant gradualness of color transition. It means that the number of options of color which the printer can display appeared less, than it is possible to reproduce on the monitor. Reduction of number of gradation can be connected as with spreading of points at the press on inappropriate paper (for example, when using for an inkjet printing of usual, but not special paper), and with inability of the device of the press to create the necessary quantity of options of the sizes of points. Of course, the offset car will reproduce (with some error) that number of points which on it was “palmed off“. But photoforms make not by shooting via mesh light filters for a long time, and remove on special type of the &ndash printer; phototypesetting submachine gun (FNA). Besides, sometimes photoforms (film) remove on office laser printers for which number of gradation - weak place. At the press of films (photoforms) the output devices using language of the description of pages Besides many other opportunities are usually used, it allows to describe a form of raster points directly. Raster points of the different size and, sometimes, quite whimsical form, are formed from some, bigger or smaller, quantities of the starting microscopic points of the printer sometimes called in literature, especially translated, by pricks. The greatest possible number of these smallest points per unit length makes resolution of the printer. This size can usually be regulated programmatically in certain borders. Permission, number of gradation and a lineature are interconnected. Let`s understand how. As there were already raster points are formed of physical points of the printer.

There is as if a filling of cells of some matrix. To provide, for example, existence of 256 gradation of color, we have to have an opportunity to receive as much different options of the size that is the smallest point has to contain 1 physical point of the printer, the largest - at least 256 points. The simplest option of receiving a figure from 256 points - a matrix of 16x16 points, that is 16 down and 16 across (actually, physical points are distributed in a body of a raster point quite whimsically, sometimes forming difficult figures, for example with a cavity in the center, but at the moment it is not important for us). At a lineature of 200 Ipi (lines on inch) in the painted most over area the number of physical points will equal to the lineature increased on 16 (an edge of a raster point). It is equal 3200 dpi (dots per inch). As you understand, it not greatest possible, but, nevertheless, quite high resolution. It can be reached only on the phototypesetting automatic machine. If you try to receive such lineature at a conclusion of films on decent office printer from it 1200 or 2400 dpi how you think what will occur? Correctly, will merge, there will be indiscernible a part of gradation of color.