JPH0694228B2 - Printed matter, original film, printing plate, and method for producing printed matter - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a technique for printing an image such as a photograph, an illustration, or a painting, and more particularly to improving print quality in appearance at a trimming peripheral portion of an image.

[Prior Art] Conventionally, images such as photographs, illustrations, and paintings are generally printed by predetermined trimming. In this case, a printing method in which the gradation of an image is expressed by halftone dot elements, such as an offset printing method or a letterpress printing method, is usually adopted.

In these printing methods, color-separated half-tone positive or half-tone negative and a trimming mask are combined in order to print only within a predetermined trimming range of an image. The printed matter printed in this way is printed only within the predetermined trimming.

For example, recently, with the rapid spread of ID cards, it has become popular to print facial photographs on telephone cards. A so-called model design telephone card is a photo that the orderer brought to a part of the card and is printed in a cutout form, or a photo is printed on the entire surface of the card, which is a memorial for the birth celebration of children and memories of family members. Popular as a product.

Such a conventional model design telephone card adopts resin letterpress as the printing format, and in the case of the photo cutting type, the screen original plate has a screen ruling of 133 lines / inch, a screen angle of 45 degrees, and a halftone dot area ratio. The light part is 10% and the shadow part is 95%.

[Problems to be Solved by the Invention] However, in a conventional model-designed telephone card or other printed matter, a trimming line of an image such as a photograph may cross the array of halftone dots obliquely, and the trimming edge of the image of the photograph or the like may occur. There are spots where the halftone dots appear to fly. For this reason, the trimming peripheral portion of the photograph does not form a clean trimming line, and the print quality on the appearance of the printed matter is deteriorated.

Such image and halftone dot jumping around the rimming edge are corrected by a specialist correction engineer using a magnifying glass and a needle. However, the correction required time per image is
Even a skilled person can reach 1 to 2 hours, so that it is impossible to cope with a short delivery time in a situation where it is practically difficult to secure a large number of correction engineers. Further, the repair work is a work with a large degree of fatigue that requires a fine nerve, and the finish is affected by the skill and condition of the repair engineer, resulting in defective products.

The present invention has been made in view of such circumstances, and it is possible to easily and quickly correct halftone dot skipping in an image peripheral portion of an image printed matter such as a model design telephone card without requiring skill. An object of the present invention is to provide a print product, an original film, a printing plate, and a method for producing a print product that can be produced.

[Means for Solving the Problems] In order to solve the problems, it has been found that the following configuration is effective. That is, in a printed matter in which the gradation of an image is formed by the elements of large and small halftone dots, a first halftone dot group (image halftone dot) representing the gradation of the image,
A second halftone dot having a uniform halftone dot (solid halftone dot) of a predetermined size with the ink of the same color as that of the first halftone dot group printed over the entire image area of the first halftone dot group. It is a printed matter in which an image is formed by a group.

In order to obtain such a printed matter, a first halftone dot group for forming the gradation of an image by the elements of large and small halftone dots, and the first halftone dot group makes uniform the predetermined size over the entire image area. It is possible to employ a method in which the first halftone dot group and the second halftone dot group are combined and printed with ink of the same color by using a second halftone dot group having different halftone dots.

In order to obtain the above-mentioned printed matter, in a printing original film in which the gradation of an image is formed by the elements of large and small halftone dots, a first halftone dot group representing the gradation of the image and the first halftone dot group It is possible to use a printing original film in which an image is formed by a second halftone dot group formed by uniform halftone dots having a predetermined size over the entire image area formed by the halftone dot group.
In a printing plate in which the gradation of an image is formed by large and small elements of a halftone dot, a first halftone dot group representing the gradation of the image and a predetermined size over the entire image area by the first halftone dot group. It is possible to use a printing plate in which an image is formed on a second halftone dot group having uniform halftone dots.

In this case, it is desirable to incline the array of plain halftone dots with respect to the array of image halftone dots by a predetermined angle so that interference does not occur between the two.

[Operation] In the printed matter according to the present invention, the second halftone dot group consisting of the plain halftone dots is scattered between the first halftone dot groups consisting of the image halftone dots at the peripheral edge portion of the image. So
The density of image halftone dots in the peripheral portion of the image trimming is corrected by the solid halftone dots, and the trimming line becomes a clean printed matter as a whole.

Embodiments Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

FIG. 1 is an enlarged schematic view showing a part of a printed matter, a printing plate or an original film according to an embodiment of the present invention, and FIG. 2 is a schematic view showing a model design telephone card on which a face photograph is printed. . As shown in FIG. 2, predetermined characters and a face photograph 3 are printed on the display surface of the telephone card 2. The card 2 is formed by sandwiching a storage medium between standard-sized plastic plates for a predetermined time. Card 2
The trimming peripheral edge portion 4 of the face photograph 3 is corrected. That is, as shown in FIG. 1, image halftone dots 5, 6 and 7 are arranged in the trimming peripheral portion 4, and these image halftone dots are arranged.
A large number of solid halftone dots 10 are scattered between 5, 6 and 7.

Next, a method for producing a printed matter according to the embodiment of the present invention will be described with reference to FIGS.

One color of the photo original is separated by an electronic plate making machine to produce a halftone negative (step 11). The condition in this case is 150 lines / inc.
h, screen angle 75 degrees, highlight area ratio is 4
%, That of the shadow part is 90%. This net negative is printed on the photosensitive member through the trimming mask by the printer (first printing) (step 12). The exposed portion is, as shown in FIG.
The halftone dot 7 is missing at. Next, a plain halftone screen as shown in FIG. 4 is printed on the same photosensitive member through a trimming mask (second printing) (step 13).
Next, the photosensitive member that has been baked twice is developed to obtain an original film (step 14). In this way, an original film as shown in FIG. 1 is produced. In this case, the plain halftone screen has a screen angle of 15 degrees, a dot area ratio of 4%, and a screen ruling of 150 line / inch. Then, the original film is used as a master to print on a printing plate material by a printer to prepare a practical plate (printing plate) (step 15). Topographically print a photo on a telephone card using this practical version.
16).

According to the above-mentioned embodiment, the halftone dot jumping at the peripheral edge portion of the image was corrected, and it was possible to fabricate a clear model-designed telephone card with a beautiful trimming line.

In addition to the above, the method for producing the printed matter of the present invention may be as follows. That is, the photographic original is separated by one color using an electronic plate making machine under the same conditions as the above method to produce a halftone negative (step 21). This screen negative is printed on a photosensitive member through a trimming mask by a printer and developed to produce a first original film. (Step 22). Using this first original film as a master, it is printed on a printing plate material by a printer to produce a first practical plate. (Step 23). Then, separately from this, the same plain type screen as that used in the above method is printed on another photosensitive member through a trimming mask and developed to produce a second original film (step 24).
Using this second original film as a master, it is printed on a printing member by a printer to obtain a second practical plate (step
twenty five). Using the first and second practical plates thus obtained, printing is sequentially performed on the telephone card with the same color ink (step 26). In this way, a telephone card similar to that obtained by the above method can be obtained.

The halftone dot area ratio of the plain halftone stencil used in the above two examples is 4% to 5 although it is related to the analysis conditions of the photographic original as a result of the experiment.
It was found that good results can be obtained by adopting the one in the range of%.

In the above-mentioned two embodiments, the example of the telephone card is described as the printed matter, but the present invention is not limited to this, and the trimming line of an image such as a face photograph of a graduation album or the like can be corrected.

Further, in the above two embodiments, the screen angle of the plain halftone screen was set to 15 degrees, but the angle is not limited to this, and it is 60 °, 75 ° as long as it is an angle that does not cause a moire draft with the image halftone dot. , 90
An appropriate angle such as degrees can be selected.

Further, in the above two embodiments, the case where the scanner negative is used has been described, but the present invention is not limited to this, and the telephone card can be manufactured by using the scanner positive.

Further, in the above two embodiments, the case of the relief printing has been described, but the present invention is not limited to this, and the intaglio printing or the lithographic printing can also be performed.

[Effects of the Invention] According to the present invention, it is possible to correct jumping of halftone dots by a simple method. Therefore, it is possible to produce a clear and clear photographic print at a low cost. Further, according to the present invention, since correction can be performed quickly without manual work, the correction time can be greatly shortened.

[Brief description of drawings]

FIG. 1 is an enlarged schematic view showing a part of a photographic print or plate according to an embodiment of the present invention, FIG. 2 is a schematic view showing a telephone card on which a facial photograph is printed, and FIG. FIG. 4 is an enlarged schematic view showing a part of the photographic print or plate of FIG. 4, FIG. 4 is an enlarged schematic view showing a part of the solid mesh plate, and FIG. 5 is a method for producing a photographic print according to an embodiment of the present invention. And FIG. 6 is a process chart of another method for producing a photographic print according to the embodiment of the present invention. 2; Photo prints (phone cards), 3; Printed photos,
4; peripheral part, 5,6,7,10; halftone dot, 9; plain halftone

Claims (4)

[Claims] 1. In a printed matter in which the gradation of an image is formed by elements of large and small halftone dots, a first halftone dot group representing the gradation of the image and the entire image area formed by the first halftone dot group are formed. A printed matter in which an image is formed by a second halftone dot group having uniform halftone dots of a predetermined size formed by printing the first halftone dot group over the same color. 2. A printing original film having gradations of an image formed by elements having different sizes, a first halftone dot group representing the gradation of the image, and an image formed by the first halftone dot group. A printing original film in which an image is formed by a second halftone dot group having uniform halftone dots of a predetermined size over the entire area. 3. A printing plate comprising gradations of an image formed by elements of different sizes, and a first halftone dot group representing the gradation of the image, and the entire image area formed by the first halftone dot group. A printing plate on which an image is formed by a second halftone dot group having uniform halftone dots of a predetermined size. 4. A first halftone dot group for forming a gradation of an image by means of large and small halftone dots, and a uniform image of a predetermined size over the entire image area formed by the first halftone dot group. Second by halftone dot
The method for producing a printed matter, comprising: combining the first halftone dot group and the second halftone dot group and printing with the same color ink.