Apparatus and method of producing a halftone image reproduction of a continuous tone photograph. Scanning means is provided to scan the photograph to be reproduced along a series of scan lines. Incremental control parameters are provided in accordance with a reproduction ratio to define predetermined scan sample points for each scan line. Control means is provided for controlling the scanning means to produce successive sets of digital sharp and unsharp gray level data signals at the predetermin...

Disclosed is an improved graphic arts process simulator, which enables accurate simulation of a letterpress graphic arts process. Existing graphic arts process simulators generally include an analog signal processor in which various signal processing elements are used to process an electrical signal representative of a halftone transparency in accordance with the steps of a selected graphic arts process. The improvement described herein is a modified analog signal processor which simulates nonun...

An halftone dot image output apparatus scans a photosensitive medium with a laser beam which is selectively turned on and off based on an indicated halftone dot area percentage that is inputted, for thereby recording the halftone dot image on the photosensitive medium, and develops the recorded halftone dot image to output a film with the halftone dot image recorded thereon. The halftone dot image output apparatus has a halftone gradation calibrator for calibrating a gradation of the halftone do...

This invention relates to a method and apparatus for the electronic screening of a graphic image to be reproduced by printing. The density of the graphic image is determined either repetitively or continuously during the generation of each dot which will form a part of the half-tone image when produced, and the dot is modified according to changes in the density. Thus the structure of any half-tone dot may be modified during its construction. Electronic screening processes are also disclosed emp...

A method of generating a bitmap representative of an original image. The method comprises (1) scanning the original image to generate a greyscale pixel map; (2) interpolating and rotating the greyscale pixel map to generate a higher resolution greyscale pixel map; and (3) converting the higher resolution greyscale pixel map into the bitmap. The greyscale pixel map is converted into the bitmap by (I) ranking each greyscale pixel value against the greyscale pixel values of a neighborhood of adjace...

A facsimile device having a copy mode includes an image reader and a recording device and forms an image with the recording device based on a received signal from a communication network or a read signal from the image reader. In the copy mode, data processing of the read image is performed in accordance with the resolution and half tone expression characteristic of the image reader and the recording device. In a facsimile mode, data processing of the image is performed with a reproduction chara...

An image outputting apparatus divides an image to be outputted into a plurality of pixels and delivers the image, with a pixel-wise concentration being modulated in multiple levels, to the output means. The image outputting apparatus includes output mode storage means which stores output modes for outputting the image in different numbers of levels of concentration equal to and less than the maximum number of levels of concentration applicable to each pixel. The image recording apparatus is capa...

A half tone reproducing circuitry in a facsimile system characterized by circuitry for pulse number modulating the image signal of an image including half tone circuitry for eliminating those pulses from the pulse frequency modulated signal occurring during the white portion of the image signal and circuitry for on and off controlling an image recording device by the modulated signal thereby reproducing the half tone of the image.

A screen system used in the electro-optical reproduction of half-tone pictures in multicolor prints are generated by an algorithm which simulates a continuous tone image containing a range of gray shades from black to white or a color separation. The "threshold equation" is the key of the invention as it calculates a threshold gray value that is compared to the desired local image value to determine whether that particular point should be "on" or "off". Which points (spots) are "on" and which ar...

The present invention produces halftone dots which shows smaller fluctuations in size and shape irrespective of variation of the positional relation between the address of screen pattern data and the recording pixels. Displacement F1 through F4 are computed at vertices of a halftone dot region VP1 through VP4. Each of the vertices is shifted to a lattice point of the scanning coordinate systems, and the X-Y coordinates of each lattice point in the scanning coordinate systems are corrected accord...