Gretag Imaging Ag

Gretag Imaging Trading Ag

Imaging Solutions A.g.

Peter Zolliker

Walter Kraft

Rudolf Wacker

Roland Meier

Erwin Heimgartner

Process for the processing of image data which represent the color values of an image, to achieve optimal color reproduction of the image by an image reproduction system, especially by a photographic printer or photolab in response to the image data. In an exemplary embodiment, the image data which represent first positions in a first color space are received. The first positions are transformed into transformation positions which represent positions in a second color space; and the response of the image reproduction system to the image data is modeled with a model image reproduction system such that the model image reproduction system outputs the response as model positions which represent the color values produced by the model image reproductions system in response to the input of the image data as positions in a second color space. Second positions in the second color space can be determined based on the transformation positions and the model positions to determine optimized image data for the control of the image reproduction system.

Optimization of image data by color management

Optimization apparatus for photographic image data with a data input device for input of first image data which are present in a first color space and represent a photographic image or a set of photographic images, an optimization device for optimizing the first image data and a data output device for output of the optimized first image data which optimally represent the photographic image or the set of photographic images, whereby the optimization device carries out an optimization transformation on the first image data, whereby the optimization transformation corresponds to a combination of at least the following transformations: a first transformation which transforms the first image data from the first color space into another, second color space; a correction transformation, which corrects the transformed first image data in the second color space; and a second transformation which transforms the corrected first image data into a third color space.

Optimization apparatus for photographic image data

In a method for calibrating a photographic copy printer, developed copies are scanned regionally (such as dotwise), and the measured light transmitted or remitted by each scanned region of the copying material is supplied to a detector array, broken down spectrally, and converted into wavelength- and intensity-dependent measurement data. The electrical measurement signals are digitized, and with their aid, copy-specific measurement data are ascertained. On the basis of the copy-specific measurement data, the original-specific measurement data, and the exposure used in the copying, a model of the original adapted to the copy material and a model for the copy material, or the model (Pi) inverse to it, which forms the basis for calculating the requisite amounts of copying light, are checked with respect to specifiable accuracy criteria and optimized as needed.

Method for calibrating a photographic copy printer

In a method for producing photographic copies, first copies are produced in a first pass in a first printer, and any second copies needed are produced in a second pass by a second printer which is calibrated to the first printer by means of a setup test method. In this setup test method, the original-specific data ascertained in the first pass are delivered to a computing and control unit of the second printer. With the aid of these original-specific data and with the aid of an original model adapted to the copying material, the requisite quantities of copying light are ascertained in the computing and control unit of the second printer, and the second copies are made. The developed second copies are subjected to an analysis. Based on the analysis, the original model adapted to the copy material is optimized for the second printer until the second copies are substantially identical to the first copies.

Method for producing photographic copies from photographic originals

A method for producing copies of photographic originals, wherein an original is scanned regionally. With the aid of measurement data thus obtained, a decision is made in a test step, on the basis of specified criteria, whether the original is worth copying or not. On the basis of this decision, the particular original is or is not copied onto photographic copy material. In the test step, the scanned original is assigned to at least one of at least three categories of originals; namely a first category which includes originals that are unequivocally worth copying, a second category which includes originals that are unequivocally not worth copying, or a third category which includes originals that are neither unequivocally worth copying nor unequivocally not worth copying. Both originals assigned to the first category and originals assigned to the third category are copied onto photographic copy material, and the copies of originals assigned to the third category are specifically identified as belonging to that category and are not included in calculating the price for processing the customer's order.

Growing community of inventors

Dielsdorf, Switzerland

Peter Zolliker