Abstract: In an apparatus and a process for obtaining image signals, and electronically mixing the image signals to generate mixed signals, the steps include modulating one of the image signals with the control signal, amplitude-inverting the control signal, modulating the other image signal with the amplitude-inverted control signal, and adding a modulated image signal so as to obtain the mixed signal. The control signal has prearranged characteristics determining the commencement and at least partly the characteristic of the modulating step.

Abstract: Apparatus and method for electronically retouching color images reproductions in which the color signals are generated by means of scanning image point by image point and by trichromatic master scanning and then the signals are digitized and the digital color values of the individual color components are stored in a storage medium and the stored color values are then changed by identifying the coordinates of the image points to be changed in the color image and simultaneously determining the coordinate identification and the locally dependent correction values for the digital color values of the color components and then changing the digital color values by applying correction values at the correction locations so as to obtain the retouched color values.

Abstract: An apparatus and a process for the recording of an image free of any line structure includes sensing an image along a set of successive scanning lines, converting light values of the scanning lines into electrical signals, processing the electrical signals, and converting the processed electrical signals into a set of successive recorded lines, predetermined groups of recorded lines corresponding to selected scanning lines.

Abstract: The drum for passing photographic paper along the surface of a heating trough is reversibly rotatable to maintain a high coefficient of friction between the exterior fibrous surface of the drum and the carrier undersurface of the paper. Drum rotation is reversed in the direction opposite to the transport of paper during periods between successive developments so as to brush the outer tips of the drum fibers against the surface of the trough, deflecting them in the direction of paper transport. The fiber surface of the drum may be set accordingly during manufacture by a grinding wheel rotated oppositely and concurrently with the drum to be finished, but at a much greater speed than the drum. The grinding wheel serves to incline the fiber tips so as to be initially directed in the direction of paper passage along the trough.

Abstract: As a means of providing for a register-true chucking of printing plates to a plate cylinder for an offset printing press, the plate cylinder is provided with a seating surface for receiving thereon a forward edge of the printing plate and a series of chuck levers for clamping the plate against the seating surface. The chuck levers pivot about a common shaft extending axially with the cylinder and are driven by means of articulated link arrangements extending from a rotatable shaft parallel with the pivot shaft. The levers are divided into first and second types, the first type having a coupler linkage designed as a pressure spring and the second type having non-resilient linkage means such that the first group of levers engage the plate ahead of the second group. The levers are each formed with a clamp surface. The clamp surface of the levers and pressure surface on the cylinder are formed with grip means for locking the forward edge of the plate onto the pressure surface.

Abstract: A method for the color evaluation of pattern models of fabric, decoration or packaging printing which, in particular, exhibit bleeding color areas, i.e. color areas of differing color saturation and/or brightness, and a color evaluation device with a color monitor is provided for carrying out the method. Color recognition signals characteristic for the individual pattern colors and a run signal, dependent on the respective color saturation, are derived from the color measured value signals obtained through opto-electric scanning of the pattern models. A freely-selectable color signal triad corresponding to the color to be displayed on the color monitor is assigned in a coloration unit to each pattern color and a further color signal triad is prescribed for the background color of the later printing medium. For displaying the pattern models on the color monitor, the color recognition signals in the coloration unit call in the color signal triads.

Abstract: A color correction technique is disclosed in which standardized color correction signals are stored in an addressable memory which emits a plurality of digitalized trichromatic picture scanning values as input values in a corresponding plurality of corrected picture recording signals as output values. An assignment of memory input to memory output is fed into the memory as standardized color correction data before reproduction. For a location to be specially corrected, the color signals thereof are measured and compared with predetermined values and a difference formation is provided between the memory output signals and the predetermined values, the difference values being stored and utilized, in connection with distance calculations of neighboring points, to input re-corrected color correction values into the addressable memory.

Abstract: An orifice for coupling a highly-evacuated electron beam gun to a rotating print form cylinder for engraving is provided such that the gun has a rigid cover with an opening for the electron beam at its end facing the print form cylinder and a flexible band is arranged at the cover which partially surrounds the print form cylinder. The band is pivoted at the cover and at least one of the pivot points is elastically designed and pivoting occurs with the aid of springs which are adjustable with respect to the spring force.

Abstract: A thermic developing station for recording material which is to be developed by means of heat, comprising a rotatable drum and a heating element which is adapted to fit the curvature of the drum surface, the recording material being fed through between the drum and the heating element by the drum and at the entrance of the recording material into the heating zone an unheated member is provided which is also adapted to fit the surface of the drum.

Abstract: The invention relates to facsimile reproduction and particularly to a method for converting a video signal obtained by scanning an original dot by dot and line by line, into a bilevel black/white signal.In the black/white recording of colored originals in which both the background and the information can be white, black, grey or colored, grey/black transitions coming from "white" and grey/white transitions coming from "black" are frequently not evaluated correctly by the dynamic threshold so that information is lost in the copy.In order that these types of transitions are also detected, it is suggested to eliminate the DC component of the video signal and to compare the video signal modified in this way with a second dynamic threshold signal derived from it.

Abstract: The invention relates to a method of determining the standard color data of colors represented on a color monitor. Within a color represented on the color monitor there is fixed a measurement area in which the color measurement data are determined. From the color measurement data there are calculated the corresponding standard color data of the color selected by the measurement area, taking into account the tube characteristics and the standard color data of the individual phosphors of the color monitor.The accuracy of the determination of standard color data can be increased by multiple measurement within the measurement area.The calculated standard color data are, for example, the starting quantities for a color mixture calculation by means of a color formula computer.

Abstract: This invention relates to the production of a printing block or form of the kind in which at least one original is scanned optoelectronically to obtain image signals being mixed to generate a composite signal and is recorded as the printing block or form, one of the image signal which is to be mixed being modulated by a control signal and the other image signal being modulated by the amplitude-inverted control signal and the modulated image signals being summated to obtain said desired composite signal, said control signal determining a mixing range and the mixing characteristic within said mixing range.According to the invention, the said control signal is derived from the color information of a colored control mask by scanning said mask or from the image content of the original.

Abstract: A device for producing corrected color chromatic components for multicolor printing wherein an original is scanned and rerecorded in the form of color separations with interposed color corrections including color correction means having an electronic color camera for scanning an original and a color viewing monitor and an adjustable color correction computer connected to the camera so as to correct the trichromatic color signals supplied by the camera and including a color converter connected between the color correction computer and the monitor for compensating for fixed parameters of the respective printing process and for adaptation of the colors to the luminescent materials of the monitor screen and including a scanning for a second scanning of the original and with a recording unit for recording the color chromatic components and wherein after correction of the color components has occurred the computer can be connected to the recording unit and receive signals directly from the scanner for reproduction.

Abstract: A method for driving an ink jet comprising a compression chamber for the ink, the volume of which is charged by means of a piezo-electric transducer by expanding the chamber in preparation for printing, contracting the chamber to print, and expanding the chamber again in preparation for another cycle of printing.

Abstract: This invention relates to a method of boosting a discontinuous-value video signal (in pulse or stepped form). From the video signal there is derived an upper accompanying signal extending above it and a lower accompanying signal extending below it, which follow the video signal dynamically. First differential values are formed between the upper accompanying signal and the video signal and second differential values are formed between the video signal and the lower accompanying signal. To boost the discontinuous-value video signal, multiples of the first differential values are subtracted continuously from the video signal and multiples of the second differential values are added to the video signal.

Abstract: The invention is applicable in the sphere of the preparation of printing blocks or forms by means of electronic color scanners. The recording of line elements (lettering, signals, edge spike, etc.) by such scanners is concomitantly performed by selective energization of separate recording beams with greater line resolution than half-tone recording. Without losing time during recording, a stair-shaped distortion of smooth line contours is reduced in such degree that it no longer makes itself felt in troublesome manner in practice.

Abstract: The invention relates to a method for producing line and continuous tone color separations of pattern models of textile, decoration or packaging printing and the like, and further relates to a color scanner. A characteristic color recognition signal for controlling the recording is obtained by color recognition for each pattern color from the color measured value signals gained by opto-electric scanning of the pattern models. For the production of line color separations, an adjustable color separation signal, which corresponds to the desired recording density, is prescribed. For the production of continuous-tone color separations, a run signal, dependent on the color saturation and/or brightness of a color in the pattern model, is derived from at least one measured color value signal and the corresponding color separation signal is derived therefrom.

Abstract: A method for the improved reproduction of edges by engraving of screened printing forms by an electro-magnetic engraving member. The engraving member is controlled by a signal obtained by superposition of an image signal and a screening signal. The image signal is derived from scanning an image pattern with a resolution which is twice as great in the scanning direction as that of the printing screen. Based on the higher resolution the image signal is converted into digital principal image values and additional intermediate image values. The principal and the intermediate image values are superimposed onto the screening signal after being converted back into an analog image signal, whereby the principal image values are superimposed at the instances of periodically recurrent amplitude values of the screening signal when the tool of the engraving member has its largest deflections in the direction of the printing form for engraving the cups arranged in the printing screen.

Abstract: In an electronic pattern generator characters to be recorded are displayed on the screen of a cathode ray tube and then exposed on a recording medium mounted on a carrier, which is displacable in a plane parallel to the plane of the screen.The characters are displayed from video-data recallable from a store. The recalled video-data are transformed into a first video signal for the brightness control of the electron beam of the cathode ray tube into first deflection signals for the beam and into displacement signals for the carrier.For controlling the make-up and composing process the characters are displayed identically on a further screen of a soft copy terminal independently of the display on the screen of the cathode ray tube.By identical display it is understood, that the various type fonts and sizes of characters are not displayed in an unitary fashion, but in the original font of writing, as they will appear later in the typographical composition on the recording medium.

Abstract: A facsimile scanning method for converting a video signal, generated by opto-electronic scanning of an original copy, into a bilevel black/white signal in facsimile reproduction.In the black/white recording of colored originals in which both the background and the information can be white, black, grey or colored, white/grey (colored)/black transitions in the original are frequently not picked up correctly so that information is lost in the copy.The invention solves this problem by recording colored, grey or black areas in the original as "white" with black boundary lines, by means of suitable electronic circuits.If the colored area in the original is a background area without information content of its own but containing a black item of information (letter), the legibility of the black letter in the area is increased in the copy by reproducing the background area as "white".