page_title: Color constancy
hierarchical_section_title: Color constancy
caption_attribution_description: English: left: John Martin, "The Bard" (1817); right: modified using GIMP, 1st: slight desaturation, 2nd: retinex filtering: Scale=160, ScaleDivision=6, Dynamic=2.5
context_page_description: Color constancy is an example of subjective constancy and a feature of the human color perception system which ensures that the perceived color of objects remains relatively constant under varying illumination conditions. A green apple for instance looks green to us at midday, when the main illumination is white sunlight, and also at sunset, when the main illumination is red. This helps us identify objects.
context_section_description: Color constancy is an example of subjective constancy and a feature of the human color perception system which ensures that the perceived color of objects remains relatively constant under varying illumination conditions. A green apple for instance looks green to us at midday, when the main illumination is white sunlight, and also at sunset, when the main illumination is red. This helps us identify objects.
caption: Achieving luminance constancy by retinex filtering for image analysis
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