Skip to main content

Subjective Assessment of Color Naturalness of Objects Illuminated by LED Light Sources with Various Color Rendering Index and Color Temperature

Buy Article:

$12.00 plus tax (Refund Policy)

Subjective evaluation of LED light sources is important because they have characteristic spectral distributions not similar to conventional light sources. Average color rendering index (Ra) is generally used as an index of color reproducibility of light sources. A simple question about “Ra” is that color temperature of light sources is not taken into account to the assessment methodology of color reproducibility. We suppose color temperature of light sources naturally affect to color reproducibility. In this study, we investigated quantitatively how Ra and color temperature of LED light sources affect color reproduction respectively. We prepared 8 commercial LED light sources which have various values of Ra and color temperature. Subjects observed 11 different objects, one by one, under each of the 8 different light sources, and assessed the color naturalness of each object under the 8 different light sources using 5 ranks of subjective score. We calculated correlation coefficients 1) between average color rendering index and subjective assessment, and 2) between color temperature of LED light sources and subjective assessment. Color temperature (correlation coefficients 0.58) showed clearly higher correlation to color naturalness than that of Ra (correlation coefficients −0.24). Thus, our subjective evaluation results have shown that color naturalness of objects is almost independent to average color rendering index of an illumination but evidently dependent to color temperature of the illumination.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Document Type: Research Article

Publication date: 2013-01-01

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.

  • Information for Authors
  • Submit a Paper
  • Subscribe to this Title
  • Membership Information
  • Terms & Conditions
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more