Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
  • H04N1/46—Colour picture communication systems
  • H04N1/56—Processing of colour picture signals
  • H04N1/60—Colour correction or control
  • H04N1/6011—Colour correction or control with simulation on a subsidiary picture reproducer

Definitions

• the present invention relates to a device for producing a printing film or color separation film according to the preamble of claim 1.
• a drum scanner is a device which has a drum-shaped holder for a positive or negative original, which is rotatable about its drum axis, wherein during the drum rotation a scanning of the image original is carried out, during which a relative displacement of the scanning device for generating the image signal and the drum in axial direction follows, so that ultimately every pixel of the original is scanned sequentially by rotating the drum and moving it axially.
• the image signal generated in this way is digitized and broken down by a computer of the drum scanner into individual digitized control signals for the colors yellow, magenta, cyan and black, a printer using these control signals to produce color separation films for the colors yellow, magenta, cyan and a black separation film generated. These films can be used to print the template. Since each original has a certain color cast and its brightness values usually do not correspond to the brightness values of an optimal original, the known drum scanner also has input means for entering color correction values or brightness correction values.
• a system for producing color separation printing plates or printing films is known, in which, in accordance with the known drum scanner system described above, a point-by-point scanning of an original is first carried out, the image signals being digitized again and broken down into color components which can be corrected for their color, the color-corrected image signals of the individual color components being able to be fed to a printer for producing the respective color separation printing plates or color separation printing films.
• the color-corrected signal can be displayed on an image display.
• this known system corresponds to the drum scanner device described at the beginning.
• the object of the present invention is to develop a device for producing a printing film or color separation film with a drum scanner in such a way that the determination of a brightness correction value and / or a color correction value for the drum scanner is simplified and made more precise, the time required to determine the relevant correction value is shortened.
• the object of the invention is used to determine a correction value by means of an analog, real-time correction value detection device which is essentially formed from a color mixing head, a video device and a monitor.
• the color mixing head produces a light which can be adjusted in terms of color and brightness for the exposure of the original, which for this purpose is preferably placed on a master stage, the master thus exposed being displayed on a monitor by means of a video device. Every change in the setting of the color mixing head can be detected immediately in real time on the monitor, so that an optimal color mixing head setting for the relevant template can be determined in a simple and time-saving manner.
• the relevant setting values of the color mixing head can be easily used as color and brightness or density correction values with which the drum scanner works when the same scanner is scanned to produce the printing films or color separation films after the entire system has been calibrated once.
• the brightness and / or color temperature of the light generated by the color mixing head is preferably detected by a sensor, the output signal of which is displayed on a display device, on the basis of the brightness and / or color correction values of the drum scanner can be set.
• Such manual adjustment is not necessary if the light sensor is connected to the drum scanner via an interface circuit, which derives brightness and / or color correction values for the drum scanner from the brightness and color temperature measured by the light sensor.
• the film forming device 2 needs not be directly connected to the drum scanner 1, but can also be connected to this 1 via a data output device which serves for the data output of control values on any storage medium, in which case the film generating device 2 is connected to a data reading device for the person concerned Data storage medium is connected.
• a data output device which serves for the data output of control values on any storage medium
• the film generating device 2 is connected to a data reading device for the person concerned Data storage medium is connected.

Landscapes

• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Facsimile Image Signal Circuits (AREA)
• Color Image Communication Systems (AREA)
• Projection-Type Copiers In General (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6392004

Family Applications (1)

Country Status (2)

Cited By (1)

Citations (5)

Family Cites Families (1)

• 1989
  • 1989-10-23 DE DE19893935236 patent/DE3935236C1/de not_active Expired - Fee Related
• 1990
  • 1990-05-02 WO PCT/EP1990/000703 patent/WO1991006173A1/de unknown

Patent Citations (5)

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