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Fast Gray Calibration for Digital Photographic Printers

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Gray calibration of a photographic printer is usually an iterative process of printing and measuring test prints with the goal to produce a gray wedge from paper white (Dmin) to the maximal reachable dark gray (Dmax). The iterative nature is due to the lack of an appropriate color reproduction model, in particular for colors not on the gray axis. A calibration method is presented based on two main elements. One element is a color reproduction model using the spectral properties of the color dyes of the photographic paper. This model was originally developed to facilitate color management for photographic printing but turned out to be very useful also for paper calibration. The other element is an analytical model for the saturation curves of the three dyes. Special attention is paid to the handling of the colors close to Dmax and Dmin. The presented method drastically reduces the number of iterations needed for the calibration process and even allows one step calibrations in many cases. A first successful implementation of this method was realized in GRETAG's CYRA FastPrint.
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Document Type: Research Article

Publication date: January 1, 2002

More about this publication?
  • Started in 2002 and merged with the Color and Imaging Conference (CIC) in 2014, CGIV covered a wide range of topics related to colour and visual information, including color science, computational color, color in computer graphics, color reproduction, volor vision/psychophysics, color image quality, color image processing, and multispectral color science. Drawing papers from researchers, scientists, and engineers worldwide, DGIV offered attendees a unique experience to share with colleagues in industry and academic, and on national and international standards committees. Held every year in Europe, DGIV papers were more academic in their focus and had high student participation rates.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual papers for details.

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