Design and Production of Color Calibration Targets for Digital Input Devices
INDUSTRIAL TECHNOLOGY RESEARCH INST CHUTUNG HSINCHU (TAIWAN) OPTO-ELECTRONICSAND SYSTEMS LABS
Pagination or Media Count:
This paper presents the design and production of calibration targets for digital input color devices. By experimentally determined gamut of surface color, this study redesigns the aim values based on ISOFDIS 12641 and to meet process specifications of Noritsu QSS23-HRCRT photographic printer with silver halide photography. The calibration target includes four components a set of 144 color patches 3 levels in lightness and 4 levels in chroma at 12 different hue angles within printing gamut, a neutral scale containing 22 steps based on visual perception, a set of C-M-Y-K-R-G-B dye scales showing characteristics of photographic materials, and a series of facial colors ranked by red. This research will describe the meaning of each element, the use of colorimetric mapping to CIELCH for each element, the conversion of these patch into a ROB-mode electronic image file, and how to control the processing of color photographic materials. And we propose an approach of dynamic subgroup linear interpolation to achieve high process quality of manufacturing calibration targets and cost-down. Finally, statistic results revealed that 99 of the patches are within 10 delta Eab of the aim values specified in this study from long-term test and 99 of the patches in the manufacturing batch are within 5 delta Eab of the mean values from short-term test.
- Printing and Graphic Arts
- Test Facilities, Equipment and Methods