"Convert::Color::HSV" - a color value represented as
my $red = Convert::Color::HSV->new( 0, 1, 1 );
# Can also parse strings
my $pink = Convert::Color::HSV->new( '0,0.7,1' );
my $cyan = Convert::Color->new( 'hsv:300,1,1' );
Objects in this class represent a color in HSV space, as a set of three
floating-point values. Hue is stored as a value in degrees, in the range 0 to
360 (exclusive). Saturation and value are in the range 0 to 1.
This color space may be considered as a cylinder, of height and
radius 1. Hue represents the position of the color as the angle around the
axis, the saturation the distance from the axis, and the value the height
above the base. In this shape, the entire base of the cylinder is pure
black, the axis through the centre represents the range of greys, and the
circumference of the top of the cylinder contains the pure-saturated color
wheel, with a pure white point at its centre.
Because the entire bottom surface of this cylinder contains black,
a closely-related color space can be created by reshaping the cylinder into
a cone by contracting the base of the cylinder into a point. The radius from
the axis is called the chroma (though this is a different definition of
"chroma" than that used by CIE).
Returns a new object to represent the set of values given. The hue should be in
the range 0 to 360 (exclusive), and saturation and value should be between 0
and 1. Values outside of these ranges will be clamped.
Parses $string for values, and construct a new object
similar to the above three-argument form. The string should be in the form
containing the three floating-point values in decimal
Accessors for the three components of the color.
Returns the derived property of "chroma", which maps the color space
onto a cone instead of a cylinder. This more closely measures the intuitive
concept of how "colorful" the color is than the saturation value and
is useful for distance calculations.
Returns the individual hue, saturation and value components of the color value.
Returns a measure of the distance between the two colors. This is the Euclidean
distance between the two colors as points in the chroma-adjusted cone space.
Returns a measure of the distance between the two colors. This is used in the
calculation of "dst_hsv" but since it omits
the final square-root and scaling it is cheaper to calculate, for use in cases
where only the relative values matter, such as when picking the "best
match" out of a set of colors. It ranges between 0 for identical colors
and 4 for the distance between complementary pure-saturated colors.
Paul Evans <firstname.lastname@example.org>
- Convert::Color - color space conversions
- Convert::Color::RGB - a color value represented as red/green/blue
- <http://en.wikipedia.org/wiki/HSL_and_HSV> - HSL and HSV on