Investigation of color inconstancy and color gamut changes of printed images depending on the standard illuminants

• Autorzy: Spiridonov I. , Shopova M. , Boeva-Spiridonova R.
• Języki publikacji: EN

Abstrakty

EN

The main goals of this research are investigation and determination of color balance failure (color inconstancy) of offset printed images expressed by color difference depending on the material used and different standard illuminant conditions. For the experiment, we chose three of the most commonly used in practice illuminants - CIE D50 natural horizon daylight with color temperature 5003 K; CIE F2 cool white fluorescent, 4230 K; CIE A typical Tungsten-filament lighting, 2856 K. A special test form that has been used contains different control strips and measurement components include test chart TC6.02 with about 1000 color patches with different percent combinations of cyan, magenta, yellow and black. The paper, printing inks and printing presses employed in the experiment are some of most commonly used in practice for producing high quality color reproductions. A series of colorimetric and densitometric measurements were performed for different combinations of C, M, Y, K in single, double, triple and quadruple overprint for high tones, middle tones and dark tones. For estimating color balance failure for all the above mentioned measurements there have been calculated the color difference ?E*ab and CMCCON02 depending on standard illuminants CIE D50, F2 and A. For the first time via experimental research in real production conditions (for offset printing method), 3D and 2D presentations and comparison of color gamuts and color gamut volumes for different illuminants were made. According to the results, CIE A has the biggest color gamut volume and CIE F2 - the smallest one. The results obtained are important from scientific and practical points of view. For the first time a methodology is suggested and implemented for examination and estimation of color shifts by studying a big number of color changes in various ink combinations for different illuminants.

Słowa kluczowe

EN

color difference; color inconstancy; standard illuminant; color gamut; volume of color gamut

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Optica Applicata
• Rocznik: 2012
• Tom: Vol. 42, nr 3
• Strony: 627--641
• Opis fizyczny: Bibliogr. 17 poz., rys., tab.

Twórcy

autor

Spiridonov I.

autor

Shopova M.

autor

Boeva-Spiridonova R.

• University of Chemical Technology and Metallurgy, Department of Printing Arts, Pulp and Paper, 8 Kliment Ohridski blvd., 1756 Sofia, Bulgaria

Bibliografia

• [1] ISO 3664:2009, Viewing Conditions – Graphic Technology and Photography.
• [2] ISO 12647-2:2004, Graphic Technology – Process Control for the Production of Half-tone Colour Separations, Proof and Production Prints – Part 2: Offset Lithographic Processes.
• [3] ISO 13656, Graphic Technology – Application of Reflection Densitometry and Colorimetry to Process Control or Evaluation of Prints and Proofs.
• [4] CHEN Y., BERNS R.S., TAPLIN L.A., IMAI F.H., A multi-ink color-separation algorithm maximizing color constancy, IS&T/SID Eleventh Color Imaging Conference, Springfield, Virginia, United States, 2003, pp. 277–281.
• [5] CHEN Y., BERNS R.S., TAPLIN L.A., Exploring the color inconstancy of prints, 10th Congress of the International Colour Association, Granada, Spain, May 8–13, 2005, pp. 657–660.
• [6] CHEN Y., BERNS R.S., TAPLIN L.A., Improving the color constancy of prints by ink design, 13th Color Imaging Conference – Color Science and Engineering Systems, Technologies and Applications, November 7–11, 2005, Scottsdale, Arizona, pp. 159–164.
• [7] ĐORĐEVIĆ D., HLADNIK A., JAVORŠEK A., Performance of five chromatic adaptation transforms using large number of color patches, Acta Graphica: Journal for Printing Science and Graphic Communications 20(1–4), 2009, pp. 9–19.
• [8] LUO M.R., LI C., HUNT R.W.G., RIGG B., SMITH K.J., CMC 2002 colour inconstancy index; CMCCON02, Coloration Technology 119(5), 2003, pp. 280–285.
• [9] KLEIN, G.A., Industrial Color Physics, Springer Science and Business Media, LLC 2010, (e-edition).
• [10] Getting Good Gray Balance by Understanding Color Inconstancy, ONYX Graphics White Paper, March, 2009.
• [11] SPIRIDONOV I., SHOPOVA M., BOEVA R., NIKOLOV M., Investigation of color balance failure of offset printed images expressed by color difference in dependence of different standard illuminant conditions, International School and Conference on Photonics, August 29–September 2, 2011, Belgrade, Serbia, (to be published).
• [12] CIE Standard; CIE Colorimetric Illuminants, ISO/CIE 10526-1991 (CIE S001-1986).
• [13] CIE International Lighting Vocabulary, item 845-02-59, CIE 17.4-1987.
• [14] CIE 15:2004 Colorimetry.
• [15] ISO 12647-1:2004, Graphic Technology – Process Control for the Production of Half-Tone Colour Separations, Proof and Production Prints – Part 1: Parameters and Measurement Methods.
• [16] ISO 105-J05:2007, Textiles – Tests for Colour Fastness – Part J05: Method for the Instrumental Assessment of the Colour Inconstancy of a Specimen with Change in Illuminant (CMCCON02).
• [17] ISO 105-J03:2009, Textiles – Tests for Colour Fastness – Part J03: Calculation of Colour Differences.