| 摘要 |
In accordance with the present invention, these and other concomitant proble ms are solved. The present invention relates to a process for making copies of photographic originals in a photographic copying machine, comprising the steps of sectionally scanning the original being copied by a measurement system in a measurement station o f the photographic color copying machine, feeding measured light that is transmitt ed or remitted from each scanned section of the original being copied to a detecto r configuration, converting the measured light into electrical signals as a function of wavelength and intensity of the measured light, digitizing the electrical signals to obtain color data for processing in a computation and evaluation unit, and analyzin g the color data in an analysis unit to establish correction values. The step of analyzi ng further includes steps of (a) subjecting the color data to a reversible linear or no n- linear standardization transformation that is order or film type specific, (b) converting the color data into normalized color values to provide initial data for the analysis unit, (c) forming film specific normalized correction values in the analysis unit from the normalized color values, taking into account color, density, and structural characteristics o f the original being copied, and (d) converting the film specific is normalized correction values of the analysis unit into de-standardized correction values in a de-standardization unit that is attached to the analysis unit using a de-standardization transformation whic h is inverse to the standardization transformation, the de-standardized correction values al so taking into account the color characteristics of the film material being copied. A required amount of copying light is determined from the de-standardized correction values in an exposure calculation unit, and copies are made from the original being copied in an exposure station based on said copying light. |
