Abstract: An image forming apparatus includes: a printing device which prints an image using a color material consumable; a storage device which stores one or more color profiles for the printing device; and a profile management unit which selects a color profile usable for printing the image from the one or more color profiles stored in the storage device. The color profile stored in the storage device has version information of color material consumables corresponding to the color profile. The profile management unit acquires version information of the color material consumable mounted on the printing device at present, and selects a color profile having the same version information as the acquired version information, as the color profile usable for printing the image.

Abstract: Images in a first drawing region on a first reading surface and in a second drawing region on a second reading surface of a both-surface targeted document satisfy both-surface targeted conditions. Images in a first drawing region on a first reading surface and in a second drawing region on a second reading surface of a non-target document satisfy non-target conditions. A processor causes a printing apparatus to execute both-surface pattern print processing for the both-surface targeted document. The processor causes the printing apparatus to execute idle feed processing for the non-target document. The both-surface pattern print processing includes processing in which a first pattern image is formed on the second reading surface and processing in which a second pattern image is formed in a region including the first drawing region on the first reading surface.

Abstract: An image forming apparatus includes: a printing device which prints an image using a color material consumable; a storage device which stores one or more color profiles for the printing device; and a profile management unit which selects a color profile usable for printing the image from the one or more color profiles stored in the storage device. The color profile stored in the storage device has version information of color material consumables corresponding to the color profile. The profile management unit acquires version information of the color material consumable mounted on the printing device at present, and selects a color profile having the same version information as the acquired version information, as the color profile usable for printing the image.

Abstract: A recording head in an inkjet recording apparatus forms an image on paper using ink. A first sheet of paper has first and second sides. A second sheet of paper has third and fourth sides. The recording head forms a first image and a first mark image on the first side based on first image data, and then a second image and a second mark image on the second side based on second image data. The first mark image represents a first reference location in a first rectangular region in which the first image is to be formed. The second mark image represents a second reference location in a second rectangular region in which the second image is to be formed. A controller determines an enlargement ratio of the second image to be formed on the fourth side based on a discrepancy between the first and second reference locations.

Abstract: A recording head in an inkjet recording apparatus forms an image on paper using ink. A first sheet of paper has first and second sides. A second sheet of paper has third and fourth sides. The recording head forms a first image and a first mark image on the first side based on first image data, and then a second image and a second mark image on the second side based on second image data. The first mark image represents a first reference location in a first rectangular region in which the first image is to be formed. The second mark image represents a second reference location in a second rectangular region in which the second image is to be formed. A controller determines an enlargement ratio of the second image to be formed on the fourth side based on a discrepancy between the first and second reference locations.

Abstract: A calibration system includes an imaging device, an image forming apparatus, and a table generating section. The image forming apparatus prints a test chart containing patches of colors on a sheet. The imaging device captures images of a reference chart containing patches corresponding to the patches in the test chart and the test chart on the sheet together to generate a picture. The table generating section: calculates a weighting coefficient for each of the patches in the picture based on a color intensity of the patch; calculates, as a representative value for each of gradations of color values of the patches in the picture, a weighted average of color values of the patches in the gradation based on the weighting coefficient; and generates a gamma correction table for correcting gradation characteristics of the image forming apparatus to gradation characteristics in accordance with the reference chart based on the representative values.

Abstract: A calibration system includes an imaging device, an image forming apparatus, and a table generating unit. The table generating unit: calculates a first weighting coefficient based on dispersion of color values of pixels inside the patch in a captured image for each of the patches where the captured image is generated by simultaneously capturing the test chart of the sheet generated by the image forming apparatus and a preliminary prepared reference chart with the imaging device; calculates a representative value for each tone of the color value of each of the patches in the test chart and the reference chart based on an average of a weighted average of the color value of the plurality of patches; and generates the gamma correction table based on the respective representative values in the test chart and the reference chart.

Abstract: A calibration system includes a photographing device, a first image forming apparatus, a second image forming apparatus, and a tone-characteristics correcting circuit. The first image forming apparatus prints a first chart including patches in a plurality of colors. The second image forming apparatus prints a second chart corresponding to the first chart. The tone-characteristics correcting circuit corrects tone characteristics of the first image forming apparatus. The tone-characteristics correcting circuit corrects the tone characteristics of the first image forming apparatus to tone characteristics of the second image forming apparatus based on a difference in color value of patches between the first chart and the second chart in a both-side print chart image generated such that the first chart and the second chart are simultaneously photographed by the photographing device.

Abstract: A calibration system includes an imaging device, an image forming apparatus, and a table generating section. The image forming apparatus prints a test chart containing patches of colors on a sheet. The imaging device captures images of a reference chart containing patches corresponding to the patches in the test chart and the test chart on the sheet together to generate a picture. The table generating section: calculates a weighting coefficient for each of the patches in the picture based on a color intensity of the patch; calculates, as a representative value for each of gradations of color values of the patches in the picture, a weighted average of color values of the patches in the gradation based on the weighting coefficient; and generates a gamma correction table for correcting gradation characteristics of the image forming apparatus to gradation characteristics in accordance with the reference chart based on the representative values.

Abstract: A calibration system includes an imaging device, an image forming apparatus, and a table generating unit. The table generating unit: calculates a first weighting coefficient based on dispersion of color values of pixels inside the patch in a captured image for each of the patches where the captured image is generated by simultaneously capturing the test chart of the sheet generated by the image forming apparatus and a preliminary prepared reference chart with the imaging device; calculates a representative value for each tone of the color value of each of the patches in the test chart and the reference chart based on an average of a weighted average of the color value of the plurality of patches; and generates the gamma correction table based on the respective representative values in the test chart and the reference chart.

Abstract: A calibration system includes a photographing device, a first image forming apparatus, a second image forming apparatus, and a tone-characteristics correcting circuit. The first image forming apparatus prints a first chart including patches in a plurality of colors. The second image forming apparatus prints a second chart corresponding to the first chart. The tone-characteristics correcting circuit corrects tone characteristics of the first image forming apparatus. The tone-characteristics correcting circuit corrects the tone characteristics of the first image forming apparatus to tone characteristics of the second image forming apparatus based on a difference in color value of patches between the first chart and the second chart in a both-side print chart image generated such that the first chart and the second chart are simultaneously photographed by the photographing device.

Abstract: An image forming apparatus includes a print device, a tone correction unit, a peripheral light quantity drop detecting unit, and a color value correction unit. The tone correction unit corrects a tone characteristic of the print device based on color values of a plurality of color patches of each of a reference chart and a test chart in an image. The image is generated by simultaneously taking a reference sheet and a test sheet by an imaging device. The reference chart is drawn on the reference sheet. The test chart is printed on the test sheet by the print device. The peripheral light quantity drop detecting unit detects the amount of the peripheral light quantity drop in each of the patches based on the positions and luminances of the plurality of reference regions in the image and the positions of the patches in the image.

Abstract: An image forming apparatus includes a print device, a tone correction unit, a peripheral light quantity drop detecting unit, and a color value correction unit. The tone correction unit corrects a tone characteristic of the print device based on color values of a plurality of color patches of each of a reference chart and a test chart in an image. The image is generated by simultaneously taking a reference sheet and a test sheet by an imaging device. The reference chart is drawn on the reference sheet. The test chart is printed on the test sheet by the print device. The peripheral light quantity drop detecting unit detects the amount of the peripheral light quantity drop in each of the patches based on the positions and luminances of the plurality of reference regions in the image and the positions of the patches in the image.

Abstract: An image creating apparatus has a printing device configured to print a changed image on a recording medium; a difficult-to-recognize color arrangement storage unit configured to store a difficult-to-recognize color arrangement that is difficult to visually recognize; an object extracting unit configured to extract objects from an original image; a difficult-to-recognize object detecting unit configured to detect a difficult-to-recognize object; a representative color obtaining unit configured to obtain the representative color of the difficult-to-recognize object; a color arrangement changing unit configured to (i) change the color arrangement of the image so that the color arrangement of the periphery is changed from the difficult-to-recognize color arrangement in at least part of the difficult-to-recognize object and (ii) embed information about the representative color as dots; and a changed image printing unit configured to command the printing device to print the changed image with the changed color arr

Abstract: An image creating apparatus has a printing device configured to print a changed image on a recording medium; a difficult-to-recognize color arrangement storage unit configured to store a difficult-to-recognize color arrangement that is difficult to visually recognize; an object extracting unit configured to extract objects from an original image; a difficult-to-recognize object detecting unit configured to detect a difficult-to-recognize object; a representative color obtaining unit configured to obtain the representative color of the difficult-to-recognize object; a color arrangement changing unit configured to (i) change the color arrangement of the image so that the color arrangement of the periphery is changed from the difficult-to-recognize color arrangement in at least part of the difficult-to-recognize object and (ii) embed information about the representative color as dots; and a changed image printing unit configured to command the printing device to print the changed image with the changed color arr

Abstract: An image data acquiring unit 32 acquires image data of a chart sheet and a reference chart and image data of the white sheet from the external imaging device. A shading correcting unit 34 generates shading correction data on the basis of a white sheet, and performs shading correction for the image data of the chart sheet and the reference chart using the shading correction data. A projective transforming unit performs a projective transformation for the image data of the chart sheet and the reference chart. A color value identifying unit identifies color values of patches in a test chart printed on the chart sheet and color values of patches in the reference chart after the shading correction and the projective transformation. A correction data generating unit generates image correction data on the basis of the identified color values of patches in the test chart and the reference chart.

Abstract: An image creating apparatus has a printing device configured to print a changed image on a recording medium; a difficult-to-recognize color arrangement storage unit configured to store a difficult-to-recognize color arrangement that is difficult to visually recognize; an object extracting unit configured to extract objects from an original image; a difficult-to-recognize object detecting unit configured to detect a difficult-to-recognize object; a representative color obtaining unit configured to obtain the representative color of the difficult-to-recognize object; a color arrangement changing unit configured to (i) change the color arrangement of the image so that the color arrangement of the periphery is changed from the difficult-to-recognize color arrangement in at least part of the difficult-to-recognize object and (ii) embed information about the representative color as dots; and a changed image printing unit configured to command the printing device to print the changed image with the changed color arr

Abstract: An image data acquiring unit 32 acquires image data of a chart sheet and a reference chart and image data of the white sheet from the external imaging device. A shading correcting unit 34 generates shading correction data on the basis of a white sheet, and performs shading correction for the image data of the chart sheet and the reference chart using the shading correction data. A projective transforming unit performs a projective transformation for the image data of the chart sheet and the reference chart. A color value identifying unit identifies color values of patches in a test chart printed on the chart sheet and color values of patches in the reference chart after the shading correction and the projective transformation. A correction data generating unit generates image correction data on the basis of the identified color values of patches in the test chart and the reference chart.