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Creating physically accurate visual stimuli for free: Spectral rendering with RADIANCE.

By Alexa I. Ruppertsberg and Marina Bloj


noVisual psychophysicists, who study object, color, and light perception, have a demand for software that produces\ud complex but, at the same time, physically accurate stimuli for their experiments. The number of computer\ud graphic packages that simulate the physical interaction of light and surfaces is limited, and mostly they require\ud the purchase of a license. RADIANCE (Ward, 1994), however, is freely available and popular in the visual\ud perception community, making it a prime candidate. We have shown previously that RADIANCE┬┐s simulation\ud accuracy is greatly improved when color is coded by spectra, rather than by the originally envisaged RGB triplets\ud (Ruppertsberg & Bloj, 2006). Here, we present a method for spectral rendering with RADIANCE to generate\ud hyperspectral images that can be converted to XYZ images (CIE 1931 system) and then to machine-dependent\ud RGB images. Generating XYZ stimuli has the added advantage of making stimulus images independent of\ud display devices and, thereby, facilitating the process of reproducing results across different labs. Materials associated\ud with this article may be downloaded from

Topics: Spectral rendering, RADIANCE
Year: 2008
DOI identifier: 10.3758/BRM.40.1.304
OAI identifier:
Provided by: Bradford Scholars
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