GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages
Convert::Color::HSV(3) User Contributed Perl Documentation Convert::Color::HSV(3)

"Convert::Color::HSV" - a color value represented as hue/saturation/value

Directly:

 use Convert::Color::HSV;

 my $red = Convert::Color::HSV->new( 0, 1, 1 );

 # Can also parse strings
 my $pink = Convert::Color::HSV->new( '0,0.7,1' );

Via Convert::Color:

 use Convert::Color;

 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

 hue,saturation,value

containing the three floating-point values in decimal notation.

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.

  • 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 Wikipedia

Paul Evans <leonerd@leonerd.org.uk>
2014-06-01 perl v5.32.1

Search for    or go to Top of page |  Section 3 |  Main Index

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.