Abstract: An image forming apparatus forms a pattern image on a sheet by irradiating a photosensitive body with laser lights emitted from first to eighth laser light sources based on timing set in a displaying/setting section. As the pattern image, a combined pattern image in which a plurality of combined images are arranged continuously in the sub scanning direction, in each of which combined images two first line images are arranged apart from each other in the main scanning direction, and the second line image is arranged therebetween.

Abstract: Disclosed is an image processor to perform error diffusion processing to an input image of m values pixel by pixel so as to convert to n values, n being smaller than m, including: a correction section to refer to a constant area which has been converted to n values before the error diffusion processing is performed to a target pixel to be an object of the error diffusion processing, and to correct a m-valued pixel value of the target pixel based on n-valued pixel values of the pixels constituting the constant area.

Abstract: Disclosed is a screen processing method, comprising: a scanning step of scanning two-dimensionally arranged pixels of an output object image in a main scanning direction and a sub scanning direction so as to extract a pixel value of each pixel; a thresholding step of counting scanning displacements in the main scanning direction and the sub scanning direction according to a screen angle by using two counters working with each other, and of discriminating each pixel position based on counted values of the counting so as to obtain a threshold value of the pixel value corresponding to each pixel position; and an outputting step of referring to a conversion table showing an relation of a output value to an input pixel value, the conversion table corresponding to the obtained threshold value, so as to obtain the multilevel output value corresponding to the extracted pixel value.

Abstract: This invention relates to an image printing system in which an image printing apparatus and an information processing apparatus are connected with each other through a network. The image printing apparatus has image reading means for obtaining image data by reading an image from an original, image printing means for printing an image on a paper sheet on the basis of image data, and first image processing means for performing an image process for image data. The information processing apparatus has second image processing means for performing an image process for image data.

Abstract: There is described an image forming apparatus to form an image on a transfer sheet, in which an image bearing member, image exposing unit for forming a latent image, developing unit for developing the latent image, an intermediate image bearing member for bearing a toner image on its surface, first transfer member for transferring the toner image from the image bearing member to the intermediate image bearing member or the first side of the transfer sheet, second transfer member for transferring said toner image from the intermediate image bearing member to the second side of the transfer sheet, fixing unit for fixing the toner images on the both sides of the transfer sheet, detector for detecting a reference position on the intermediate image bearing member, and controller for controlling timing to start forming the latent image and/or timing to feed the transfer sheet to the first transfer member on the basis of the detection of the reference position on the intermediate image bearing member, are. included.

Abstract: An image transmission apparatus includes an original reading unit, a memory, a communicating unit, an impressing unit, and a controller. The memory stores an image signal read by the original reading unit. The impressing means impresses a predetermined stamp on an original. The controller controls the impressing unit so that different stamps are impressed when the read image signal is directly transmitted by the communicating unit and when the read image signal is stored in the memory means.