JPS6134144B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides electronic color separation, correction, and
This relates to a method for attaching originals to a direct scanner that outputs shaded documents. In recent years, in color scanners, light is applied to a color original and the colors are separated through a filter, then converted into electric current, which undergoes necessary corrections and conversions on the circuit, and then converted back into light to expose the film and obtain each separated plate. During output, devices are in widespread use that expose light onto lithium film through a contact screen, or digitize it and use electronic means to output halftone dots with different areas depending on the photographic density. In the case of general work, it does not matter if the document is placed in any position and at any angle, and even if the halftone dot angles of each halftone plate are not at the regular angles, the relative angle difference will be maintained. If there is, the effect of moiré phenomenon will not occur.

However, it is possible to print the halftone plate output by this method, for example, after printing a white line gravure screen on a sensitized carbon tissue, and then inserting a diffusion sheet between the halftone plate and the carbon tissue. When gravure plate making is performed by transferring the thus obtained carbon tissue to a gravure cylinder and etching it, if the screen angles of the halftone plates do not match, moiré will occur due to the relationship with the gravure screen. The present invention has been made to solve such problems, and it relates to a method for easily placing a document on the document cylinder of a color scanner at the correct angle according to the trimming instructions. This also applies when the screen angle is restricted due to a pattern, etc. Another object of the present invention is to facilitate positioning when laying out two or more color originals and scanning them at the same time.
By applying masking, it is also possible to easily perform operations such as removing characters, overlaying characters, and trimming on a color scanner.

The details of the present invention will be explained below with reference to the drawings.

First, a mount 1 is obtained from a designated mount for layout using the method described below so that the size is a reciprocal of the enlargement rate planned for the color scanner. Generally, the designated mount for layout is written with finished dimensions, so in order to match it with the original original, it is necessary to reduce the size at the same rate as the magnification that is planned to be enlarged with a color scanner.
One method for this is to take a picture with a camera for plate making. In this case, it is convenient to use a positive-type photosensitive material or to obtain a positive image directly by reversal development. On the other hand, using a table-type projection device or camera, set a reference line that is correctly perpendicular to the horizontal and vertical directions on the document frame, set up a designated mount for layout according to the reference line, and check the planned magnification with a color scanner. It is also possible to project the image at a magnification that is the reciprocal of .

A layout film 2 with a grid-shaped gauge that is accurately orthogonal is placed on the mount 1 thus obtained, and the position is fixed with punch pins, sellotape, or the like. This layout film 2 is a film with good cuttability and little expansion and contraction, with grid-like lines on a translucent background with a photographic density that does not cause flare effects when exposed on a color scanner. desirable. For example, in the case of ordinary plate-making film, a line drawing with a grid pattern is exposed to light on a lithographic film, and then a fog density is applied to the entire film. may be given to the whole. Alternatively, the grid-like line drawing may be made into a negative image with an appropriate overall density, or the grid-like line drawing may be printed with high accuracy on a translucent film.

The layout film 2 is trimmed using a cutter or the like to open a window 3 as shown in FIG. 1, and the original is pasted in that position. FIG. 2 shows the state in which the layout film 2 with originals A, B, and C pasted in this way is pasted onto the original cylinder 4 of a color scanner. A reference line 5 and a reference line 6 perpendicular to it are drawn. Documents A, B, and C are placed on a layout film 2 having a window 3 as described above in such a document cylinder 4 and having a grid-like horizontal and vertical line 7.
Paste the pasted lines to the reference lines 5 and 6 along with the grid-shaped lines 7 shown in broken lines (in the figure, only a portion is shown and the rest are omitted). Align and secure the ends of the corresponding lines exactly as illustrated. With this method, the originals A, B, and C can be pasted correctly at a constant angle according to the layout instructions, and the coordinate values can be read from the latitude lines 7 drawn on the layout film 2. If you include a scale, you can lay out several manuscripts and expose them on one sheet of film.
By placing a character or trimming mask on a mask cylinder in a similar manner, it becomes possible to perform complex trimming, cut-out characters, superimposed characters, etc. In particular, as described above, if a projector is used in combination, even if the magnification ratios of the respective documents are different, it is possible to perform registration scanning relatively easily.

[Brief explanation of the drawing]

The drawings show a specific example of the method of mounting a document according to the present invention, and FIG. 1 is a front view showing a state in which a layout film with windows provided at predetermined positions on a mount is pasted, and FIG. FIG. 2 is a perspective view showing a state in which a layout film is pasted onto a document cylinder of a color scanner. 1... Mounting paper, 2... Layout film, 3
...window, 4...manuscript cylinder, 5, 6...reference line, A, B, C...manuscript.

Claims (1)

[Claims] 1. A layout in which line drawings in a grid-like pattern are formed over the entire surface on a mount obtained by photoengraving, etc. so that the size is the reciprocal of the magnification rate planned for the color scanner from the specified mount for layout. After placing the layout film, first open a window in the area where the original will be pasted on the layout film according to the trimming instructions.
After repeating the operation of pasting the originals on the layout film for the number of originals and removably setting multiple originals on the layout film, one of each of the longitudinal lines of the layout film is formed on the original cylinder. Place the layout film on the original by aligning it with a reference line parallel to the cylinder axis, a reference line set at the line that appears when the imaginary plane perpendicular to the cylinder axis intersects the circumference of the original cylinder, respectively. A collar that is characterized in that only the original can be directly attached to the desired position of the original cylinder by pasting it correctly on the cylinder at a certain angle, then fixing only the original on the original cylinder, and removing the layout film. How to mount a manuscript on a scanner.