Human eye distinguishes colours according to the varying
sensitivity of different cone cells in the retina to light of
different wavelengths. There are three types of colour
photoreceptor cells (cones) for human with sensitivity
peaks in short (bluish, 420e440 nm), middle (greenish,
530e540 nm), and long (reddish, 560e580 nm) wavelengths
. A colour sensation no matter how
complex can be described using three colour components
by eyes. These components, which are called as tristimulus
values, are yielded by the three types of cones based on the
extent to which each is stimulated. Colour space is a mathematical
representation for associating tristimulus values
with each colour. Generally there are three types of colour
spaces, namely hardware-orientated space, humanorientated
space, and instrumental space. Some colour
spaces are formulated to help humans select colours and
others are formulated to ease data processing in machines
(Pascale, 2003). 3D demonstration of some colour space
images generated by the free software RGBCube except the
HSV space is illustrated in
Human eye distinguishes colours according to the varying
sensitivity of different cone cells in the retina to light of
different wavelengths. There are three types of colour
photoreceptor cells (cones) for human with sensitivity
peaks in short (bluish, 420e440 nm), middle (greenish,
530e540 nm), and long (reddish, 560e580 nm) wavelengths
. A colour sensation no matter how
complex can be described using three colour components
by eyes. These components, which are called as tristimulus
values, are yielded by the three types of cones based on the
extent to which each is stimulated. Colour space is a mathematical
representation for associating tristimulus values
with each colour. Generally there are three types of colour
spaces, namely hardware-orientated space, humanorientated
space, and instrumental space. Some colour
spaces are formulated to help humans select colours and
others are formulated to ease data processing in machines
(Pascale, 2003). 3D demonstration of some colour space
images generated by the free software RGBCube except the
HSV space is illustrated in
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