27 September 2016 Evaluation of color grading impact in restoration process of archive films
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Color grading of archive films is a very particular task in the process of their restoration. The ultimate goal of color grading here is to achieve the same look of the movie as intended at the time of its first presentation. The role of the expert restorer, expert group and a digital colorist in this complicated process is to find the optimal settings of the digital color grading system so that the resulting image look is as close as possible to the estimate of the original reference release print adjusted by the expert group of cinematographers. A methodology for subjective assessment of perceived differences between the outcomes of color grading is introduced, and results of a subjective study are presented. Techniques for objective assessment of perceived differences are discussed, and their performance is evaluated using ground truth obtained from the subjective experiment. In particular, a solution based on calibrated digital single-lens reflex camera and subsequent analysis of image features captured from the projection screen is described. The system based on our previous work is further developed so that it can be used for the analysis of projected images. It allows assessing color differences in these images and predict their impact on the perceived difference in image look.
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Karel Fliegel, Karel Fliegel, Stanislav Vítek, Stanislav Vítek, Petr Páta, Petr Páta, Petr Janout, Petr Janout, Jiří Myslík, Jiří Myslík, Josef Pecák, Josef Pecák, Marek Jícha, Marek Jícha, } "Evaluation of color grading impact in restoration process of archive films", Proc. SPIE 9971, Applications of Digital Image Processing XXXIX, 997121 (27 September 2016); doi: 10.1117/12.2237558; https://doi.org/10.1117/12.2237558

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