摘要:
A printed tone control method for adjusting a printed color tone by comparing image data serving as a reference and image data obtained by reading an image from a print actually made by a printing machine. The method includes a representative point setting step for setting a representative point for use in control of the color tone based on image data, an alternative representative point setting step for setting an alternative representative point that satisfies a predetermined condition when a point inappropriate for tone measurement is selected as the representative point, and a tone adjusting step for adjusting the color tone by using the alternative representative point.
摘要:
The disclosed method and apparatus execute a printing step for setting a printing condition concerning at least one of a printing machine, a dot pattern, printing paper and ink, and printing an image having a plurality of different dot percentages with the printing condition set; a profile creating step for creating a profile showing printing stability in form of a relationship between the printing condition and each of the dot percentages by measuring a print image obtained in the printing step; a calculating step for deriving printing stability for each color area of an image to be printed, from image data of the image to be printed, the printing condition in time of printing and the profile; and a displaying step for displaying the printing stability of each color area, obtained in the calculating step, of the image to be printed.
摘要:
An ink feeding rate control method for a printing machine includes a step of determining, from image data used in recording images, an average of image area ratios of images in areas on prints corresponding to ink keys, a step of determining, from the image data, an average of image area ratios of images in positions aligned in a printing direction with the detecting patches (i.e. rectangular areas having substantially the same width as the detecting patches and extending in the printing direction) printed in the areas on the prints corresponding to the ink keys, and a step of correcting the reference information based on the average of image area ratios of the images in the areas on the prints corresponding to the ink keys, and the average of image area ratios of the images in the positions aligned in the printing direction with the detecting patches printed on the prints.
摘要:
A patch measurement device which is capable of accurately detecting the position of a patch in a control strip is provided. In a patch measurement device 27, a data storage section 271 stores printed-image data containing a control strip printed on a printed material. A reference mark detection section 272 detects the positions of cross points P corresponding to reference marks rm contained in the printed-image data. An inter-mark distance calculation section 273 calculates a measured shortest distance with respect to the cross point P. An inter-mark distance correction section 274 calculates magnification correcting coefficients k, by utilizing theoretical shortest distances among the cross points P in deployed position information and the measured shortest distance. Based on the magnification correcting coefficients k and the values of pixels constituting the printed-image data, a patch position detection section 275 finalizes the patch position. A color density measurement section 276 measures the color density of the patch whose position has been detected by the patch position detection section 275.
摘要:
A white reference value and a corresponding transport speed are stored in memory. A black reference value and a corresponding imaging speed are also stored. Next, a printing operation is started and color values and a corresponding transport speed are stored. Accurately corrected color values are derived from the stored white reference value, transport speed, black reference value, imaging speed, color values and transport speed.
摘要:
A printing machine control method according to this invention includes a platemaking step for making a printing plate having, formed thereon, a test pattern with different dot percentages for areas corresponding to ink keys, a first printing step for making prints by using the printing plate; a first density measuring step for measuring and storing, at intervals of time, density of the test pattern on printing paper, a second printing step for making prints after changing opening of the ink keys, a second density measuring step for measuring and storing, at intervals of time, density of the test pattern on printing paper, and a control step for correcting an amount of change in the opening of the ink keys based on the density measured in the first density measuring step and the density measured in the second density measuring step, and correcting an interval between changes in the opening of the ink keys based on a time taken until stabilization of the density measured in the second density measuring step.
摘要:
A printing plate developing method includes an image recording step for recording an image on a printing plate with an image recorder, an ink key opening degree setting step for setting opening degrees of ink keys in an ink feeder such that the larger opening degree is set for the smaller image percentage in regions, corresponding to the respective ink keys, on the printing plate having the image recorded thereon, a preliminary ink feeding step for feeding the ink to the ink rollers, an ink transfer step for transferring the ink from the ink rollers to the dampening water rollers, a dampening water feeding step for feeding the dampening water to the printing plate with the dampening water rollers, an ink feeding step for feeding the ink to the printing plate with the ink rollers, and a transfer step for transferring the ink from the printing plate to printing paper.
摘要:
An ink feeding method includes a density reading step for reading density data obtained by measuring densities of detecting patches on a first image, before an end of a printing operation, a first computing step for computing, from the density data, an ink feed film thickness remaining after prints having the first image are made, a second computing step for computing an ink feed film thickness required for making prints having a second image, from a target density for the prints having the second image, a third computing step for computing a preset ink feeding rate from the ink feed film thickness remaining after the prints having the first image are made, computed in the first computing step, and the ink feed film thickness required for making the prints having the second image, computed in the second computing step, and an ink feeding step for feeding the preset ink based on the preset ink feeding rate computed in the third computing step.
摘要:
A printed tone control method for adjusting a printed color tone by comparing image data serving as a reference and image data obtained by reading an image from a print actually made by a printing machine. The method includes a representative point setting step for setting a representative point for use in control of the color tone based on image data, an alternative representative point setting step for setting an alternative representative point that satisfies a predetermined condition when a point inappropriate for tone measurement is selected as the representative point, and a tone adjusting step for adjusting the color tone by using the alternative representative point.
摘要:
There is provided a patch measurement device which, even if the position of a patch in a control strip printed on a printed material is incorrectly detected, does not affect the controlling of the printing apparatus. A data storage section 271 in a patch measurement device 27 stores printed-image data Dpd. A reference mark detection section 272 detects a reference mark rm in the printed-image data Dpd, and generates position data thereof. A reference mark position data comparison section 273 compares the position data against past position data stored in a reference mark position data storage section 274 to determine the validity of the position data. If the position data is valid, a patch position detection section 275 detects a patch whose color density is to be measured. A color density measurement section 276 generates color density measurement data of the printed patch. A color density calculation section 277 calculates color density information Dct by using current and past color density measurement data stored in a color density measurement data storage section 278.