Method and a device for recorrecting standard color corrections in a color picture recording

In apparatus for the area-wise change of standardized color corrections in color reproduction devices in which an addressable memory receives a plurality of digitalized trichromatic picture scanning values as input values and emits a corresponding plurality of corrected picture recording signals as output values, and in which an assignment of memory input to output values is input into the memory as standardized color correction data before the reproduction, the improvement therein comprising:

• for a location to be specially corrected, means for measuring the color correction values;
• means for forming difference values from the deviations between the memory output signals and predetermined values;
• means for calculating correction values from the difference values;
• and
• means for replacing the corresponding correction values in the addressable memory with the calculated correction values.

In an apparatus for providing area-wise changes of standardized color corrections in color reproduction devices, in which an addressable memory is provided for the color correction, which memory receives a plurality of digitalized trichromatic picture scanning values as input values and emits a corresponding plurality of correct picture recording signals as output values, whereby the assignment of memory input and memory output values is input into the memory as standardized color correction data before the reproduction, and including a recording unit which can be connected to the correction memory, the improvement comprising:

• a display unit connectible to the output of the color correction memory for displaying the corrected printing ink signals of an image point of the original situated under the scanning unit;
• a printing ink signal memory connectible to the output of said color correction memory for receiving the corrected printing ink signals of the image point situated under the scanning device;
• a reference value memory having a printing ink signal reference value input for receiving reference values;
• a comparator connected to said printing ink signal memory and to said reference value memory for determining the differences between reference values and printing ink signals;
• a difference signal memory connected to said comparator for receiving difference signals;
• and
• an adder connectible to said color correction memory, said adder being connected by way of said difference signal memory to said printing ink signal memory and said comparator.