This document discusses angle resolved color measurements of prints and bulk scattering media. It finds that standard color measurement models like CIELAB do not capture angular variations in color. It presents a radiative transfer model called DORT2002 that can simulate angular light scattering. Measurements of white and blue dyed samples are shown to have color changes with viewing angle, while simulations with the DORT2002 model agree with these measurements. It questions whether the white point is independent of viewing angle during chromatic adaptation. The work is supported by Kempe foundations and the author can be contacted at ludovic.coppel@lgcresearch.se.

1. Angle Resolved Colour of
Prints
Ludovic Gustafsson Coppel

2. om ism
oc hr
Go ni

4. Neuman, Coppel and Edström, Angle resolved color of bulk
scattering media, Applied Optics, 50(36), 2011

5. SIB Labs, University of Eastern Finland,Joensuu.

7. Standard CIELAB
∆Ε ≈ 20 !

8. Modelling angle resolved light scattering
Kubelka-Munk does not capture angular variation
Solve the general radiative tranfer problem, DORT2002
Edström, SIAM Rev 47(447), 2005

9. White
Blue dyed Measurements RT simulations

10. len ge
Ch al
Why don't we see what we measure
and predict ?

11. Standard CIELAB

12. ma tic
ro ion
Ch tat
ad ap
Is the white point independent of
the viewing angle?

13. White paper chromatic adaptation

14. Thank you for your attention !
ludovic.coppel@lgcresearch.se
Kempe foundations