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COLOUR PHYSICS AND MEASUREMENT
(TE 509)
LECTURE 1
• Colors are important in both identifying objects,
i.e., in locating them in space, and in re-
identifying them
• Much is known about human color vision both
subjectively and quantitatively from the fields of
physics, psychology and physiology
• Despite much thought, by philosophers and
scientists, we seem little closer now to an
agreed account of color than we ever were ! ! !
• The disagreement:
• Some theorists believe colors to be perceiver-
relative, e.g., dispositions or powers to induce
experiences of a certain kind, or to appear in
certain ways to observers of a certain kind
• Others take them to be objective, physical
properties of objects
• The major problem with color has to do with
fitting what we seem to know about colors into
what science, particularly physics, tells us about
physical bodies and their qualities
• we experience color as an intrinsic feature of the
surfaces of physical bodies, or as a property
spread throughout a volume, e.g., Apple Juice
• It is this problem that historically has led the
major physicists who have thought about color,
to hold a common view: that the colors we
ordinarily and naturally take objects to possess,
are such that physical objects do not actually
have them
• COLOUR is a sensory perception
produced in brain.
• It requires:
• A Light Source
• An Object
• An Observer