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Color Difference Evaluation and Calculation for Digital and Printed Images

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Abstract:

The calculation method of color difference in images is still an unsolved issue. A series of experiments and calculations have been done to test the consistency between computing color difference and perceptual one in images. Five ISO SCID images N2, N3, N4, N5 and N7 were used as the test image in the experiments, whose color were altered in lightness, chroma and hue independently or simultaneously to form the test image pairs. Each image pair was of different color difference grade. CIELAB, CIE94, CIEDE2000 and CMC color difference were computed by averaging color difference pixel by pixel for digital images and by averaging color difference of 256 typical color patches extracted from each image for printed images. The digital test images were displayed on an EIZO CG19 LCD and the printed test image pairs were viewed in a D50 light booth. The experimental results showed that the lightness, chroma and hue difference behaved differently when plotted the perceptual color difference against computed ones. This implied that the color difference formulae should be optimized and different weighting factors should be added to different visual attributes. The color difference formulae can be optimized by the slope of fitting lines of C*/L*. The optimized CIELAB(1.5:1), CIE94(3:1), CIEDE2000(2.3:1) and CMC(3.4:1) for digital images and CIELAB(1.58:1), CIEDE2000(1.75:1) and CMC(1.84:1) or CIELAB(2.44:1.54:1), CIEDE2000(2.76:1.58:1) and CMC(2.74:1.49:1) when hue is considered for printed images by experiment data performed much better than the original formulae.

Document Type: Research Article

Publication date: 2012-01-01

More about this publication?
  • For more than 30 years, IS&T's series of digital printing conferences have been the leading forum for discussion of advances and new directions in 2D and 3D printing technologies. A comprehensive, industry-wide conference that brings together industry and academia, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems?particularly those involved with additive manufacturing and fabrication?including bio-printing, printed electronics, page-wide, drop-on-demand, desktop and continuous ink jet, toner-based systems, and production digital printing, as well as the engineering capability, optimization, and science involved in these fields. In 2016, the conference changed its name formally to Printing for Fabrication to better reflect the content of the meeting and the evolving technology of printing.

    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 paper for details.

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