Linotype-hell Ag

Uwe-Jens Krabbenhoeft

Joern Kowalewski

Peter Dorff

Sigrid Anni Doehler

Method for generating harmonic color corrections in a color image. The color image is deposited in an image store and is displayed on a monitor. Color samples of the colors that are to be subjected to a selective color correction are taken from the image with a coordinate input means. Color correction values that act on the colors defined by the color samples are input. In order to obtain harmonic transitions at the locations in the image where the selected colors meet non-selected, neighboring colors, the color correction decreases toward the edges of the color correction area. This is achieved by a filtering of the color samples or color correction values. A color computer calculates the corresponding color correction values.

Method for generating smooth color corrections in a color space,

In a method for producing geometric masks, a color image is displayed on a monitor. Color samples are taken from the image with a coordinate input unit and are deposited in a color sample memory. Color correction values that modify colors identified by the color samples can be input. A color computer serves the purpose of fast calculation of the color correction. For generating geometric masks, the color computer is loaded with an extreme value at the locations that are identified by the color samples. For that purpose, a table in the color computer is loaded with the extreme value at the corresponding location. The color image data are then applied to the color computer and the output data of the color computer are compared to a threshold. When the result is positive, a location in the mask memory is set. After all image pixels have been compared in this way to the thresholds, the mask memory contains a geometric mask at all locations that belong to the color samples. The masks in the image can be displayed on a monitor and can be used in the standard way for image processing.

Method for generating geometric masks with a digital color computer

A method for selective color correction of a color image that is deposited in a store and is displayed on a monitor. Color samples of the colors that are to be corrected are taken from the image with a coordinate input means. The color samples are deposited in a color sample memory and form a cloud in a CIELAB color space. This cloud usually has gaps and singular dots. In order to avoid discontinuities, the cloud is filtered and the gaps and singular dots are thus removed. The arrangement of the color samples in the color space can be displayed in a dialogue window in that color correction values are also input. A color computer uses the color samples and the color correction values for the selective color correction of the image. The image corrected in this way can be stored in the store and can be used for the production of color separations.

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Landwehr, Germany

Uwe-Jens Krabbenhoeft