NAME
    "Convert::Color" - color space conversions and named lookups

SYNOPSIS
     use Convert::Color;

     my $color = Convert::Color->new( 'hsv:76,0.43,0.89' );

     my ( $red, $green, $blue ) = $color->rgb;

     # GTK uses 16-bit values
     my $gtk_col = Gtk2::Gdk::Color->new( $color->as_rgb16->rgb16 );

     # HTML uses #rrggbb in hex
     my $html = '<td bgcolor="#' . $color->as_rgb8->hex . '">';

DESCRIPTION
    This module provides conversions between commonly used ways to express
    colors. It provides conversions between color spaces such as RGB and
    HSV, and it provides ways to look up colors by a name.

    This class provides a base for subclasses which represent particular
    color values in particular spaces. The base class provides methods to
    represent the color in a few convenient forms, though subclasses may
    provide more specific details for the space in question.

    For more detail, read the documentation on these classes; namely:

    *   Convert::Color::RGB - red/green/blue as floats between 0 and 1

    *   Convert::Color::RGB8 - red/green/blue as 8-bit integers

    *   Convert::Color::RGB16 - red/green/blue as 16-bit integers

    *   Convert::Color::HSV - hue/saturation/value

    *   Convert::Color::HSL - hue/saturation/lightness

    *   Convert::Color::CMY - cyan/magenta/yellow

    *   Convert::Color::CMYK - cyan/magenta/yellow/key (blackness)

    The following classes are subclasses of one of the above, which provide
    a way to access predefined colors by names:

    *   Convert::Color::VGA - named lookup for the basic VGA colors

    *   Convert::Color::X11 - named lookup of colors from X11's rgb.txt

CONSTRUCTOR
  $color = Convert::Color->new( STRING )
    Return a new value to represent the color specified by the string. This
    string should be prefixed by the name of the color space to which it
    applies. For example

     rgb:RED,GREEN,BLUE
     rgb8:RRGGBB
     rgb16:RRRRGGGGBBBB
     hsv:HUE,SAT,VAL
     hsl:HUE,SAT,LUM
     cmy:CYAN,MAGENTA,YELLOW
     cmyk:CYAN,MAGENTA,YELLOW,KEY

     vga:NAME
     vga:INDEX

     x11:NAME

    For more detail, see the constructor of the color space subclass in
    question.

METHODS
  ( $red, $green, $blue ) = $color->rgb
    Returns the individual red, green and blue color components of the color
    value. For RGB values, this is done directly. For values in other
    spaces, this is done by first converting them to an RGB value using
    their "to_rgb()" method.

COLOR SPACE CONVERSIONS
    Cross-conversion between color spaces is provided by the "convert_to()"
    method, assisted by helper methods in the two color space classes
    involved.

    When converting $color from color space SRC to color space DEST, the
    following operations are attemped, in this order. SRC and DEST refer to
    the names of the color spaces, e.g. "rgb".

    1.  If SRC and DEST are equal, return $color as it stands.

    2.  If the SRC space's class provides a "convert_to_DEST" method, use
        it.

    3.  If the DEST space's class provides a "new_from_SRC" constructor,
        call it and pass $color.

    4.  If the DEST space's class provides a "new_rgb" constructor, convert
        $color to red/green/blue components then call it.

    5.  If none of these operations worked, then throw an exception.

    These functions may be called in the following ways:

     $other = $color->convert_to_DEST()
     $other = Dest::Class->new_from_SRC( $color )
     $other = Dest::Class->new_rgb( $color->rgb )

  $other = $color->convert_to( $space )
    Attempt to convert the color into its representation in the given space.
    See above for the various ways this may be achieved.

AUTOLOADED CONVERSION METHODS
    This class provides "AUTOLOAD" and "can" behaviour which automatically
    constructs conversion methods. The following method calls are identical:

     $color->convert_to('rgb')
     $color->as_rgb

    The generated method will be stored in the package, so that future calls
    will not have the AUTOLOAD overhead.

OTHER METHODS
    As well as the above, it is likely the subclass will provide accessors
    to directly obtain the components of its representation in the specific
    space. For more detail, see the documentation for the specific subclass
    in question.

AUTHOR
    Paul Evans <leonerd@leonerd.org.uk>