A method and apparatus for reproducing half-tone pictures utilizing rastered scanning in which the change in the picture element units occur during the transfer from the original to the reproduction with the use of an electronically stored recording data and where the date can be changed in a selectable manner to increase or decrease the raster and or the scale of the reproduction.

A method and apparatus for reproducing an original image, having a scanner which scans and digitizes the original image into pixels, a controller coupled to the scanner to receive the digitized original image, and which produces a first signal corresponding to a gray level halftoned representation of the digitized original image, and a printer coupled to the controller to receive the first signal and which produces a gray level halftoned reproduction of the original image. The controller groups ...

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...

The technique of the invention sequentially supplies dot data to multiple dot formation elements, which are actuated to create dots simultaneously on multiple pixel arrays arranged at preset intervals, and thereby completes a resulting output image on an output medium. The procedure temporarily stores received dot data in a memory, reads out only dot data of the multiple pixel arrays, on which dots are to be created simultaneously by the multiple dot formation elements, converts the read-out dot...

Input gray-scale bit map information is inputted to an image forming position extracting unit for extracting image forming position information. An input computer-formed image is inputted to an image forming position extracting unit for generating an image forming position. At an image forming position overlapping unit, two image forming positions are overlapped with each other, and the composed image forming position is sent to a pixel value calculating unit and an image forming position determ...

The invention relates to a method for applying colors by subdividing the colors according to percentages allocated to each of the printing points which are, for example, divided centesimally in accordance with a rule which defines the distribution of appropriately superimposed basic colors, thereby creating binaries and blacks according to the subtraction of the percentage of the basic color most used percentually from the sum of basic colors less used percentually. Thus, the totality of visible...

An image forming device which perform tone reproduction of a by changing the size of dots according to input image data comprising a plurality of pixels, each of which has an image density. A block partitioning portion partitions the input image data into blocks, each which has a predetermined number of pixels and each of the pixels having a predetermined position within each of the blocks. A tone modulation portion determines priorities corresponding to predetermined positions of the pixels wit...

A method for the raster reproduction of half-tone pictures wherein a picture is scanned photoelectrically dot-by-dot and voltage values are generated and quantified to represent brightness ranges and wherein an alternating voltage is superimposed on the voltage values before they are quantified to generate a mixing of dot sizes indicative of one brightness range with dot sizes indicative of another adjacent brightness range and to cause the mixing to occur in such a pattern as to make transition...

A method for developing calibration curves and for calibrating a halftone imaging device to reproduce on an imaging medium gray scale values equal to input gray scale values entered in said imaging device. According to this method a calibration function representing a linear change in reproduced halftone dot size on said imaging medium as a function of input halftone dot size is developed by using the device to reproduce on an imaging medium at least two test input dot values representing two di...

A method for printing images on a substrate wherein the image has a textured, three-dimensional appearance is described. The printing method comprises printing a graphic design consisting of very fine lines having varying width, shape and orientation. This process is effective on the first surface of a pre-metalized substrate and on the second surface of a clear substrate. The lines are printed using an ink which even after drying or curing has a thickness (height above the film) to produce the ...