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Conference Paper

Apparent Greyscale: A Simple and Fast Conversion to Perceptually Accurate Images and Video

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Smith,  Kaleigh
Computer Graphics, MPI for Informatics, Max Planck Society;

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Myszkowski,  Karol
Computer Graphics, MPI for Informatics, Max Planck Society;

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Citation

Smith, K., Landes, P.-E., Thollot, J., & Myszkowski, K. (2008). Apparent Greyscale: A Simple and Fast Conversion to Perceptually Accurate Images and Video. In G. Drettakis, & R. Scopigno (Eds.), The European Association for Computer Graphics 29th Annual Conference, EUROGRAPHICS 2008 (pp. 193-200). Oxford: Blackwell.


Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-1AF9-D
Abstract
This paper presents a quick and simple method for converting complex images and video to perceptually accurate greyscale versions. We use a two-step approach first to globally assign grey values and determine colour ordering, then second, to locally enhance the greyscale to reproduce the original contrast. Our global mapping is image independent and incorporates the Helmholtz-Kohlrausch colour appearance effect for predicting differences between isoluminant colours. Our multiscale local contrast enhancement reintroduces lost discontinuities only in regions that insufficiently represent original chromatic contrast. All operations are restricted so that they preserve the overall image appearance, lightness range and differences, colour ordering, and spatial details, resulting in perceptually accurate achromatic reproductions of the colour original.