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SUMMARY:Towards the Geometry of Color Space
DTSTART;TZID=Europe/London:20260526T160000
DTEND;TZID=Europe/London:20260526T170000
DTSTAMP:20260525T064347Z
UID:4297d98d-6219-f111-8342-7c1e522d9057
CREATED:20260306T140044Z
DESCRIPTION:A foundational question in perceptual science is the extent to
  which we can describe the relations between stimuli within the framework 
 of a metric geometry. In the case of color\, careful experiments have reje
 cted the possibility that a Euclidean geometry can accurately describe sup
 rathreshold judgments. Open\, however\, is whether a more general Riemanni
 an geometry can play this role. A key factor that has limited firm conclus
 ions is that to fully test Riemannian ideas\, one requires a full characte
 rization of color discrimination thresholds around every point in color sp
 ace and for perturbations in every color direction. Recent advances in mac
 hine learning make measurement of this discrimination field tractable\, an
 d we have now made comprehensive measurements of color discrimination thre
 sholds. The measurements enable computation of Riemannian geodesic distanc
 e between any two points in color space. I will describe our procedures\, 
 threshold and suprathreshold color difference measurements\, and evaluatio
 n of geometric models of color comparison.
LAST-MODIFIED:20260420T130353Z
LOCATION:The Life and Mind Building\, The Life and Mind Building South Par
 ks Road  Oxford Oxfordshire OX1 3RB United Kingdom
SPEAKER:Professor David Brainard
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