Abstract: An image forming apparatus includes: an image forming unit for forming a correcting image for correcting gradations of an output image, on a bearing body; a sensor for measuring reflected light quantity of the correcting image formed on the bearing body; a gradation correcting unit for correcting the gradations of the output image, based on a measurement result of the measured reflected light quantity of the correcting image; and a timing correcting unit for detecting a shift of measurement timing, based on the measurement result by the sensor, and for correcting the detected shift of the measurement timing.

Abstract: To improve operationality in color adjustment of an image quality, colored characters, or the like of a document including one of a character image, a photographic image, and a screened halftone image of chromatic or achromatic color, the invention comprises image processing means (36) for identifying a character area, a photographic area, and a screened halftone area of a document on the basis of a first parameter and determining whether one or more of the character area, the photographic area, and the screened halftone area of the document are chromatic or achromatic on the basis of a second parameter to perform image processing according to them; operation setting means (14) for setting the first and second parameters; and control means (15) for displaying a first parameter adjustment content for use in identifying one or more of the character area, the photographic area, and the screened halftone area of the document and a second parameter adjustment content for use in determining whether one or more of t

Abstract: An image forming apparatus, comprising: an image forming section for forming and outputting a predetermined gradation patch pattern image on transfer paper; a sensor for reading and outputting the gradation patch pattern image; and a control section for correcting reading characteristics of the sensor on the basis of an output value of the sensor obtained by reading the gradation patch pattern image and a color value of the gradation patch pattern image formed on the transfer paper.

Abstract: An image forming apparatus, comprising: an image forming section for forming and outputting a predetermined gradation patch pattern image on transfer paper and forming it inside itself; a sensor for reading and outputting the gradation patch pattern image formed inside the image forming section; and a control section for correcting reading characteristics of the sensor on the basis of an output value of the sensor obtained by reading the gradation patch pattern image and a color value of the gradation patch pattern image formed on the transfer paper.

Abstract: An image forming apparatus includes: an image forming unit for forming a correcting image for correcting gradations of an output image, on a bearing body; a sensor for measuring reflected light quantity of the correcting image formed on the bearing body; a gradation correcting unit for correcting the gradations of the output image, based on a measurement result of the measured reflected light quantity of the correcting image; and a timing correcting unit for detecting a shift of measurement timing, based on the measurement result by the sensor, and for correcting the detected shift of the measurement timing.

Abstract: To improve operationality in color adjustment of an image quality, colored characters, or the like of a document including one of a character image, a photographic image, and a screened halftone image of chromatic or achromatic color, the invention comprises image processing means (36) for identifying a character area, a photographic area, and a screened halftone area of a document on the basis of a first parameter and determining whether one or more of the character area, the photographic area, and the screened halftone area of the document are chromatic or achromatic on the basis of a second parameter to perform image processing according to them; operation setting means (14) for setting the first and second parameters; and control means (15) for displaying a first parameter adjustment content for use in identifying one or more of the character area, the photographic area, and the screened halftone area of the document and a second parameter adjustment content for use in determining whether one or more of t

Abstract: An image process apparatus has: a halftone process section for performing a halftone process on image data input from an image reading device which reads a document image; and a block average process section, wherein the halftone process section generates a continuous pattern in a fashion of a line structure by performing a dither process on the image data input, and the block average process section divides the image data input into a plurality of blocks whose centers approximately correspond to a centerline of the line structure generated by the halftone process section, calculates an average value of pixel values in each block, and replaces the pixel values in each block with the average value calculated.