Abstract: A method and an apparatus are provided for contrast intensification in the reproduction of masters in the field of electronic image processing by engraving devices and scanners. In the image-point-wise, opto-electronic master scanning, two outer field signals are obtained in addition to the image signal by scanning a first outer field and a larger, second outer field. A first differential signal and a second differential signal are generated from the image signal and the outer field signals and a third differential signal is generated from the two outer field signals. The first differential signal is combined with at least one of the other two differential signals to form an auxiliary signal which is added to the first differential signal in order to obtain a correction signal. The correction signal is then superimposed on the image signal for the purpose of contrast intensification.

Abstract: An apparatus and a method for the recognition of colors on a colored image illuminated with a light source of a known spectrum composition, wherein the intensities of three primary colors are measured opto-electronically as color components, which represent the spatial co-ordinates of the color locations in a color space. Prior to color recognition the color components of at least one characteristic test point in each color or color region, which is to be recognized, are measured and noted. The test color components represent the corresponding test color locations in the color space. An identification symbol is assigned to each color component triplet of the test points and noted too.

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: Apparatus and method for color correction in the manufacture of printing forms which uses a correction circuit to determine correction parameters that are stored and then used in a correcting circuit for the color correction process and wherein the determination and correction are separate processes and in which in the correction circuits there are arranged a regulating unit controlled by digital values in the path of each the signal to be corrected and that the regulating units can be adjusted for determination of the correction parameters to digital values so as to obtain the desired correction and which are then stored in a storage medium from which they can be transferred in at least one correction circuit for a subsequent color correction process.

Abstract: An arrangement for the recording of rastered half tone pictures, in which each covering dot is formed in a raster field, with the size of the dot being dependent upon the light directed on different portions of the raster field, by a plurality of individual light beams coordinated in a line and focused on the recording medium by objective lens means, in which an optical element is disposed in the beam path to such objective lens means to refract light in the direction of said line, with such optical element occupying approximately half of the total projection cross section of all of the component light beams, and with the boundary of the projection cross section extending transversely to said line direction of the light beams.

Abstract: A method and apparatus for producing rastered printing forms, in which an image pattern is opto-electronically scanned to obtain an image signal, and the printing form production is effected by means of an energy beam recording device controlled by the image signal, whereby the raster points are recorded in a raster network having arbitrary raster angles, by means of relative motion between the printing form and the recording device, in which the pattern to be reproduced is scanned to simultaneously provide image signals for a plurality of adjacent image points of such a pattern, following which, for the control of the recording device, the image signal of that image point is selected whose local position on the image pattern is congruent with the local position of the raster point to be presently recorded, in the formation of the desired raster angles.

Abstract: A method for the reproduction of an image pattern disposed on a substantially nonuniformly driven scanning drum, wherein the image pattern is photo-electrically scanned point-by-point and line-by-line to generate an image pattern signal having an analog relationship to the image pattern and the image pattern signal is used to record on at least one recording drum driven substantially nonuniformly and independently of the scanning drum, features generating a scanning timing signal in synchronism with the rotational movement of the scanning drum, converting the image pattern signal to a digital signal in synchronism with the scanning timing signal, storing the digital signal in a storage unit measure-by-measure in synchronism with the scanning timing signal, generating a recording timing signal in synchronism with the rotational movement of the recording drum, reading out the digital signal from the storage unit measure-by-measure in synchronism with the recording timing signal, and, thereafter, driving at leas

Abstract: A method for the reproduction of an image pattern disposed on a substantially nonuniformly driven scanning drum, wherein the image pattern is photoelectrically scanned point-by-point and line-by-line to generate an image pattern signal having an analog relationship to the image pattern and the image pattern signal is used to record on at least one recording drum driven substantially nonuniformly and independently of the scanning drum, features generating a scanning timing signal in synchronism with the rotational movement of the scanning drum, converting the image pattern signal to a digital signal in synchronism with the scanning timing signal, storing the digital signal in a storage unit measure-by-measure in synchronism with the scanning timing signal, generating a recording timing signal in synchronism with the rotational movement of the recording drum, reading out the digital signal from the storage unit measure-by-measure in synchronism with the recording timing signal, and, thereafter, driving at least