22 December 1998 Designing method for tone and color reproducibility of digital still cameras and digital prints
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Abstract
A private standard and procedure for designing tone and color reproducibility of digital still cameras are described. We defined a 'hub' color space which interconnect input devices and output devices. As the images taken by digital still cameras are usually displayed 'as is' on CRTs and often exchanged as digital image files, the color space employed in compliant to the international standard, Recommendation ITU-R BT.709. We also defined a procedure for designing image processing parameters of digital still cameras to achieve proper exposure level, tone reproduction curve, color hue and saturation. The basis of this procedure is to reproduce subject color correctly in the hub color space. Every our digital still camera product is designed and evaluated following this procedure to minimize the difference of the image characteristics between products. Objective and colorimetric evaluation is performed by analyzing the image data hot in a studied where illuminants are strictly controlled. Subjective evaluation is performed by taking pictures under many different conditions and print them by a photographic color printer. Also described are some analysis on image characteristics of digital still camera when its images are printed on silver halide paper. Some limitations and difficulties to produce 'photographic' print from 'CRT' oriented image are presented and discussed.
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Hitoshi Yamashita, Hitoshi Yamashita, } "Designing method for tone and color reproducibility of digital still cameras and digital prints", Proc. SPIE 3648, Color Imaging: Device-Independent Color, Color Hardcopy, and Graphic Arts IV, (22 December 1998); doi: 10.1117/12.334584; https://doi.org/10.1117/12.334584
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