JP2005246224A - Construction plate printing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction plate printing method capable of freely and simply preparing a large number of gradation colored patterns slightly different from each other with multi colors. <P>SOLUTION: The construction plate printing method consists of a step S1 of specifying a gradation region on the surface to be printed of a construction plate, a step S2 of thinning-out and dispersing pixels within the gradation region, a step S3 of converting RGB data to dispersion WCMYK data, a step S4 of moving each ink dot element, a step S5 of slightly shifting the whole, and a step S6 of superposing the same on the dispersion WCMYK data. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a building board printing method capable of creating a natural blurred color pattern image for use in inkjet printing of a building board.

  In the field of building board coating by the ink-jet method, a unique texture of so-called “blur color pattern” is widely preferred. In Patent Document 1, using the first and second ink jet coating heads subsequent thereto, different colors of paint sprayed from each are mixed on the printed surface of the building board, thereby blurring the color. A technique for expressing a pattern is disclosed.

  Specifically, while the paint droplets ejected from the first head and landed on the printing surface do not dry, the paint droplets from the second head are ejected to mix both the paint droplets, and then By making it dry, a blurred color pattern is developed.

  As a cause of the appearance of such a blurred color pattern, a paint with a lot of solvent components having a low viscosity is used (the pigment can be easily moved), and the amount of the paint dropped in one drop is relatively large. (It is easy to diffuse a wide range of pigments) Furthermore, paint droplets of different colors are mixed together (the mixed state of different color pigments changes and they do not dissolve each other), and transpiration removal of the solvent by drying In addition to this, the direction of the wind generated when the work plate travels and the change in the air volume may have a significant effect, and the action with the passage of time of the pigment (dye component) moving with the passage of time has occurred. it is conceivable that.

  On the other hand, the uneven design surface (printed surface) of each building board has variation factors such as thickness variation and surface roughness that occur during substrate manufacturing, and is also processed in the painting process. Factors such as atmosphere and drying conditions vary, and the finish (image) of the finished product is the same in one lot, but it is not completely finished in the same image. It can be said that there is.

  In contrast to the above-described ink jet coating method, according to the ink jet printing method, an extremely small amount of ink droplets land on the surface to be printed in a very short time, so that the printed image is immediately fixed at the landing position. As a result, even if there is a slight variation factor on the side of the printing plate, the printed image is almost the same image. That is, it may be said that there is almost no change effect with the passage of time.

  Therefore, when considering whether or not the ink jet printing method can produce a blurred color pattern, for example, according to Patent Document 2, a paint color simulation is performed on a screen to create a blurred color pattern (for example, a paint tool). It seems that the RGB (Red Green Blue) image data of the created original image may be converted directly into CMYK (Cyan Magenta Yellow BlacK) print control data.

  However, even with a paint tool or the like, it is difficult to develop a printed image as a result of the above-described action with time. Further, since the portion of the blurred color pattern generally has many light-colored portions, naturally, the printed dot density becomes coarse for that portion. As a result, it is inevitable that the print base color is affected. There is a method using an actual photograph, but the labor of creating a paint sample for creating an original image is too large.

  Next, there is a method of painting a characteristic blurred color pattern according to Patent Document 3. In this method, the printing dot density is changed by controlling the opening and closing of the individual inkjet nozzles, thereby producing a blurring effect. Therefore, it is conceivable that the RGB image data of the original image created by this method is directly converted into CMYK print control data.

  However, this method is only a painting method, and the ink (paint) ejected from the print head is pre-adjusted and has a large amount of dripping, and also has a pre-printed background. Since the base coating is applied in this step, the blurred color pattern to be developed must be a unique pattern, and the versatility of the expressed image is lacking.

Here, consider the case where the blurred color pattern that has been converted to CMYK print control data is printed by the inkjet printing method. As a printed image, a very small amount of printing ink is fixed at the landing position in a short time. For this reason, naturally the same blurred color pattern is reproduced in the produced finished printed image.
Japanese Patent No. 2784529 Japanese Patent No. 3330577 Patent No. 3027366

  However, despite the appearance of the appropriate blurred color pattern, the same color pattern must be repeated, and the appearance design in the construction state in which a large number of printed boards are fastened to the building outer wall. There is a good chance of causing a monotonous feeling.

  Therefore, it is necessary to pattern a large number of print control data for expressing a slightly different blurred color pattern, and change the print image to be expressed for each sheet by changing the order of use. In order to adopt this method, it is necessary to create print control data for the entire surface to be printed for each plate to be processed, which makes the work difficult.

  An object of the present invention is to provide a building board printing method capable of easily and easily creating a number of blurred color pattern images which are slightly different from each other in multi-color, covering the drawbacks of the above-described method. Yes.

  The architectural board printing method of the present invention includes an area designating step for designating an area to be blurred with respect to an original image of a printing board, a thinning step for thinning out pixels in the area at a predetermined ratio, A data conversion step for converting the entire RGB image with thinned pixels into a WCMYK image, a dot movement step for moving the constituent ink dot elements of the WCMYK image in the region, and after the movement processing in the region A shift step for slightly shifting the image in a predetermined direction, and a superimposition step for superimposing the images before and after the shift.

  Further, since the dot moving step is a moving amount corresponding to the ink, actual printing can be simulated well.

  In addition, the dot moving step can simulate actual printing well because the moving direction is different on the left and right of the building board traveling direction.

  In addition, the shift step is in a different shift direction depending on the building board, so that a variety of color patterns can be realized in the overall appearance design in the construction state in which a large number of building boards are fastened to the outer wall of the building. Can do.

  According to the present invention, instead of creating a blurred pattern image first and converting it to CMYK print control data as in the conventional method, an unblurred image is created first. (Because it is a normal image, it is easy to create and you can use photos etc.), and multiple prepared `` moving patterns '' can be expressed in any order in any part (of course all) It is possible to convert the original image into a desired blurred color pattern image simply by specifying whether or not to perform.

  In addition, the movement pattern to be used incorporates various factors for the expression of the blurring effect, such as the composition of the ink used, changes in the state of the processing atmosphere such as wind, and the influence of the passage of time necessary for blurry coating. By doing so, a more natural blurred color pattern can be expressed.

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a flowchart illustrating a building board printing method according to an embodiment of the present invention. Based on this flowchart, the building board printing method of a present Example is demonstrated in order below.

  First, in order to create on the screen a blurred color pattern that is manifested by conventional blur painting, the expression mechanism of the blurred image is considered from the viewpoint of pixel movement on the RGB screen.

  FIG. 2 is a diagram for explaining the expression mechanism of a blurred image. As shown in the figure, in the state before blurring, a large number of pixels existing in the image region s composed of a plurality of pixels are subjected to blurring processing, so that a part of the pixels is surrounded by the surrounding area E1. It moves so as to diffuse and forms a new outline E2. Further, the remaining pixels also diffuse and move from the original position to the periphery (● → ○).

  If there is no difference in the movement attribute of each pixel and there is no disturbance factor in the blurring process, each pixel on the original outline E1 moves on the radiation from the center point of the original image to the surroundings by an equal distance a. . Such an image change is caused by a simple enlargement process, and appears as a change in image resolution on the screen.

  Specifically, the number of constituent pixels (colored ink dots) in the enlarged image region S is the same as the number of constituent pixels n in the original image region s before the enlargement process, and there is no change, and the pixel density (n / S of the enlarged image). ) Is smaller than the pixel density (n / s) of the original image before enlargement processing (∵S> s). Since the pixel density correlates with the image resolution, the image resolution can be changed according to the enlargement process after all. This means that the degree of blurring of a blurred image can be regarded as the degree of enlargement processing, and thus the degree of image resolution.

  In addition, the partial image corresponding to the original image area s before the enlargement process in the enlarged image area S naturally has the same low image resolution as the image resolution after the enlargement process. This is a partial image of an enlarged image that occupies the s portion. Then, the content of the partial image is a basic image (an original image serving as a basis for forming a blurred image) for an image region that is relatively positioned with an occupation ratio of (s / S) in the original image before the enlargement process. Has been expanded.

  Here, for example, if each of the image states of low image resolution to high image resolution is a four-step pattern P1 to P4, and P4 is the image resolution of the original image, P1 to P3 are indices proportional to the degree of blurring. .

  What must be considered here is a case where an image region in which a blurred image is to be formed is designated for the original image. If the partial image of the original image for the designated area is enlarged, the range in which the enlarged image is formed will greatly protrude from the designated area. It means that the primary color will change.

  By the way, since the image resolution correlates with the pixel density, in the case of an RGB image (dot matrix) developed on the screen, the image resolution can be reduced by increasing or decreasing the number of pixels arranged on the horizontal line and the vertical line. Can be changed. Currently, in order to form a blurred image, we are considering lowering the image resolution, so in order to reduce the number of pixels on each line that make up the original image specifically, on the horizontal and vertical lines. It suffices to thin out pixels every predetermined number from a group of pixels arranged in a row.

  When a process of thinning pixels is performed on a partial image of a designated area in the RGB image (original image) that has been developed (when there is no dimensional change of the image because it is not an enlargement process), Since only an image change (a pixel at a short distance is deleted) that lowers the density of the constituent pixels is brought about, the color density of the original image in the designated region is lowered, but the color tone of the original image can be preserved in a rough manner. Therefore, by designating a blur formation image region and thinning out pixels in the region, it is possible to exert a simple blur effect on that portion.

  FIG. 3 is a diagram for explaining region designation and pixel thinning according to the present embodiment. First, as shown in FIG. 3 (a), a plurality of areas to be blurred are specified for the original image (image resolution pattern P4) of the printing board (indicated by a rectangular area in the figure). (It is not limited to these and any figure may be used) (step S1), and desired image resolution patterns P1 to P3 are designated for each designated region. This is a user input operation.

  In order to make the pattern misalignment less noticeable at the left and right joints of the printing plate, it is effective in terms of construction appearance to bring a blurred pattern.

  Next, in response to an input operation by the user, as shown in FIG. 3B, each designated area portion to be blurred is individually taken out (cut out), and according to the designated image resolution patterns P1 to P3, The constituent pixels in the part are thinned out. For example, P3 is thinned down to 1/4, P2 is thinned down to 1/9, and P1 is thinned down to 1/16 (step S2).

  Subsequently, each partial image after thinning is pasted on the corresponding portion shown in FIG.

  FIG. 4 is a diagram for explaining a CMYK dispersion image. Next, the processed image (RGB image) corresponding to the entire printed board on which the thinned image is pasted is converted into distributed CMYK print control data shown in FIG.

  Further, all blank portion data W (position information) is extracted from the obtained distributed CMYK print control data, and this is taken out as print heads HW (color ink dots) in the print heads HW, HC, HM, HY, HK shown in FIG. Control data for jetting white ink (or a light-colored ink such as beige in consideration of the overall color tone) of the print base (excluding the formation position of the print base). Step S3).

  In this way, distributed WCMYK print control data for one processed plate is obtained. Then, with this distributed WCMYK print control data, it is possible to partially express a simple blurred color pattern in the original image.

  In the present invention, data processing is further performed so as to incorporate the processing characteristics as attribute information in the distributed WCMYK print control data in order to approximate the action of actual blur coating.

  FIG. 6 is a diagram for explaining an accompanying air flow with respect to a traveling building board, and FIG. 7 is a diagram for explaining a movement pattern set corresponding to the accompanying air flow. In the building board that travels, an accompanying air flow is generated in the diagonally left and right direction in the reverse traveling direction. The ink landing position is caused to flow by the accompanying air flow, that is, moves. In order to reflect this in the color pattern, the degree is approximately proportional to the traveling speed, and depending on the position on the printed surface, the direction of the building board is directed in different directions on the left and right across the center line of the traveling direction. Assuming multiple movement patterns are set. For example, there are six types of movement patterns AR1 to AR3 and AL1 to AL3. In AR, the image area in the right half of the direction of travel of the workpiece is processed, and in AL, the image area of the left half in the direction of travel of the processed board is processed. The square shown in FIG. 7 corresponds to one pixel shown in FIG. 4, and the constituent ink dot elements (WCMYK) are omitted. The arrows shown in the squares indicate the wind direction (θ1 to θ3). When the traveling speed is low, θ1 to high, θ3.

  FIG. 8 is a diagram for explaining the flow characteristics of ink. The figure tentatively shows the flow characteristics of each pigment component of the ink CMYK. For example, the relative flow characteristics can be grasped by developing each pigment component with thinner (used in the case of painting) (FIG. 9). reference). For example, it is assumed that the movement patterns of large fluidity to small fluidity are B1 to B4, and here there is a fluidity difference that satisfies Y> M> C> K.

  Therefore, if the movement pattern shown in FIG. 8 is assigned to each constituent ink dot element of each pixel shown in FIG. 7, the movement direction and the movement amount of each constituent ink dot element are determined. Further movement processing is performed for all constituent ink dot elements (step S4).

  Here, in the case where the blur designation area extends over the left and right areas which are divided into two in the traveling direction of the processed plate as in the blur designation area (2) BR2 shown in FIG. By performing the same movement process in the reverse direction of the traveling direction (θ = 0, that is, the left direction in the figure) on the image region KR of layer 1, the left and right moving part images are merged.

  Since the CMYK dispersion image shown in FIG. 4 and the RGB display image shown in FIG. 3A correspond one-to-one, the above movement process is performed for the CMYK dispersion image corresponding to the designated blurred image region. The process is performed on the region, and the processed partial CMYK dispersion image is overlaid from the top of the CMYK dispersion image (layer 1) before processing (step S6). At that time, a plurality of print control patterns are created by slightly shifting (shifting) the CMYK dispersed image after the moving process in the up, down, left, and right diagonal directions, and the order of use is determined randomly or in a predetermined order. (Step S5).

  FIG. 11 is a diagram illustrating an example of the usage order of the print control patterns. In FIG. 11A, printing control patterns are used in the order of no shifting → lower right → no shifting → upper left → no shifting. In FIG. 11B, printing control patterns are used in the order of no shift → lower → lower right → upper → upper left.

  In this way, the blurring area and the blurring degree (image resolution of that portion) shown in FIG. 3 (a), the movement pattern shown in FIGS. 7 and 8, and the order of use of the printing patterns shown in FIG. A more natural blur printing finish can be achieved with only an input operation. More specifically, the blur print finish results when the moving image (layer 2 image) shown in FIG. 10 is superimposed on the simple blur print image (layer 1 image) shown in FIG. A large number of building boards are printed in a state in which the blur print image area that is expressed is slightly shifted for each of the building boards that are provided to each.

  In the present invention, it is possible to freely express a desired blurred color pattern pattern using only the created print control data without using any thinner as in the case of blur coating.

  In addition, this invention is not limited to the said Example.

It is a flowchart explaining the building board printing method by one Example of this invention. It is a figure explaining the expression mechanism of a blurred image. It is a figure explaining the area | region designation | designated and pixel thinning of a present Example. It is a figure explaining a CMYK dispersion | distribution image. It is a figure which shows the example of print head arrangement | positioning. It is a figure explaining the accompanying airflow with respect to the running building board. It is a figure explaining the movement pattern set corresponding to an accompanying air flow. It is a figure explaining the flow characteristic of ink. It is a figure which shows the structure which grasps | ascertains the flow characteristic of an ink. It is a figure explaining the process in which a blurred color pattern pattern is created. It is a figure which shows the example of the usage order of a printing control pattern.

Explanation of symbols

A1-A3, AL1-AL3, AR1-AR3, B1-B4 Movement pattern s, S Image area E1, E2 Outline line HW, HC, HM, HY, HK Print head P1-P4 Image resolution pattern

Claims (4)

An area designating step for designating an area to be blurred with respect to the original image of the printing board;
A thinning step of thinning out pixels in the region at a predetermined rate;
A data conversion step of converting the entire RGB image from which pixels in the region are thinned into a WCMYK image;
A dot moving step for moving the constituent ink dot elements of the WCMYK image in the region;
A shift step of slightly shifting the image after the movement processing in the region in a predetermined direction;
A building board printing method comprising: a superimposing step of superimposing images before and after the shift.   2. The building board printing method according to claim 1, wherein the dot moving step is a moving amount corresponding to ink.   3. The building board printing method according to claim 1, wherein the dot moving step has different movement directions on the left and right of the building board traveling direction. The building board printing method according to any one of claims 1 to 3, wherein the shift step has a different shift direction depending on the building board.

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