Abstract: Diaphragm arrangement for point-by-point electro-optical scanning of originals, whereby the scan point is composed of a central main field and of a surrounding field surrounding the main field. A diaphragm for scanning the main field and a second diaphragm for scanning the surrounding field are provided, whereby the sizes of the diaphragm apertures of the two diaphragms are continuously adjustable independently of one another, whereby the diaphragm apertures of the first diaphragm define the size of the main field and, thus, the scanning fineness and the inside diameter of the surrounding field, and the diaphragm aperture of the second diaphragm defines the size of the surrounding field, and whereby the size relationship between main field and surrounding field is continuously adjustable on the basis of the independent and continuous adjustment of the two diaphragm apertures.

Abstract: A method and apparatus for producing color separations for single color printing in electronic reproduction, for example in textile, decorative, or packaging printing. A colored master is optoelectronically scanned point-by-point and line-by-line to obtain color signals. Color recognition signals which identify the different colors of the master during scanning are produced from the color signals. Further corrected color separation signals are obtained from the color signals. The corrected color separation signals are controlled by selected color recognition signals representing selected colors of the master. The color separation signals are switched on by the color recognition signals when the corresponding colors in the master are identified, and are switched off when the colors are not present. At least two switched on color separation signals form a recording signal which controls the recording of the color separations for the different colors of the master.

Abstract: This invention relates to a method for improving contrast accentuation in the case of the re-recording of originals in the sphere of electronic image processing by means of graving devices and scanners. An image signal is obtained by scanning an original opto-electronically dot-by-dot and line-by-line, and at least one surround signal is obtained by evaluating the surrounding area of the image dots. A correction signal which is superimposed on the image signal for the purpose of contrast accentuation is derived from the surround signal and the image signal. The original is thereupon re-recorded on a recording medium to an optional reproduction scale.

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: 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: 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: 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: 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 including a circuit arrangement for adjusting the color signal levels of a white dot in dot and line-wise reproduction of color picture patterns with a scanning instrument and in which for each color includes a photo converter for obtaining a color signal voltage and further including amplifiers receiving the output of each of the converters and wherein the gain of the converters and/or the amplifier are adjustable by means of a control signal through a regulating device. The circuit arrangement can be used not only in color scanners but also in black-white scanners.

Abstract: In the scanning and reproduction apparatus, the signal level of the "black point" or darkest portion of an image, is automatically adjusted without disturbing the previously adjusted white level, by placing a level adjusting circuit in the signal path between the scanner and the reproduction device and including in the adjusting circuit elements affecting a decrease of the operational signal from black to white thereby avoiding disturbing the white level, and wherein the derived image signal of the darkest image portion or "black point" is checked against a reference signal as the scanning proceeds, and also checked for coincidence with the reference signal.

Abstract: An improved color adjustment circuit for a color scanner in which a photoelectric scanning device obtains color signals and which supplies separated output signals to color correction circuits and wherein the output of the scanning device can be disconnected from the correction circuit during adjustment of the correction circuit and wherein for each of the picture points which is to be examined a variable memory receives and stores the color signal values for the picture points from the scanning device and the outputs of these memories can be connected to the input of the correction circuit for adjusting the individual color correction values of the correction circuit.

Abstract: Improved sharpness is obtained in an arrangement for recording continuous-tone pictures in which electro-optic picture scanning apparatus produces picture signals which are applied to an electro-optic recorder to reproduce the picture on a recording medium. Circuits for generating a sharpness signal and for modulating the sharpness signal in dependence upon the picture content of at least a portion of the picture pattern are provided. The modulated sharpness signal is then superimposed on the picture signals to influence the sharpness of pictures recorded by the recorder.

Abstract: A method and apparatus for improving sharpness when recording half tone pictures wherein picture signals are provided by means of optical/electrical scanning of picture patterns which are superimposed for an increase of sharpness during recording while utilizing a sharpness signal which is provided during the scanning process wherein the sharpness signal is changed in accordance with the picture content of the picture pattern prior to superposition thereof with the signals derived from scanning the picture.