Supplemetal Material

Color constancy supports cross-illumination color selection

Supplemental Material

Ana Radonjić, Nicolas P. Cottaris & David H. Brainard

Experimental instructions

Stimulus geometry

Blender file specifying the position of each element in the stimulus (Experiment 1) is available here (Blender is required to view this file).

Stimulus colorimetry

Illuminants. Spectral power distribution for each simulated illuminant as tab delimited text.
Table format: 1st column: wavelength in nm (400 - 700 nm, 1 nm steps); 2nd column: illuminant spectrum.
Different spectral sampling was used for rendering in Experiment 1 (400 - 700 nm, 10 nm steps).

Experiment 1:     Illuminant-constant condition: StandardLeft (6500°K), StandardRight (6500°K)
                           Illuminant-change condition: Standard (6500°K), Yellowish (4500°K), Bluish (12000°K)
Experiment 2:     Illuminant spd: Standard (6500°K), Yellowish (4500°K), Bluish (12000°K)

Targets. Simulated surface reflectance as tab delimited text.
Table format: 1st column: wavelength in nm (400 - 700 nm, 1 nm steps); 2nd column: spectral reflectance.
Different spectral sampling was used for rendering in Experiment 1 (400 - 700 nm, 10 nm steps).

Experiment 1: Target reflectance: Gray (T1), Rose (T2), Teal (T3), Green (T4)
Experiment 2: Target reflectance: Gray (T1), Rose (T2), Teal (T3), Green (T4).

Competitor sets. CIELAB, xyY and LMS values (Stockman & Sharpe 2° cone fundamentals) of each target (T) and its competitor set tabulated for each illumination condition. Competitor notation is the same as that used in Figure 2.
Experiment 1: Targets and competitors: CIELAB, xyY and LMS
Experiment 2: Targets and competitors: CIELAB, xyY and LMS