NAME

       "Convert::Color::RGB" - a color value represented as red/green/blue

SYNOPSIS

       Directly:

        use Convert::Color::RGB;

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

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

       Via Convert::Color:

        use Convert::Color;

        my $cyan = Convert::Color->new( 'rgb:0,1,1' );

DESCRIPTION

       Objects in this class represent a color in RGB space, as a set of three floating-point
       values in the range 0 to 1.

       For representations using 8- or 16-bit integers, see Convert::Color::RGB8 and
       Convert::Color::RGB16.

CONSTRUCTOR

   $color = Convert::Color::RGB->new( $red, $green, $blue )
       Returns a new object to represent the set of values given. These values should be
       floating-point numbers between 0 and 1. Values outside of this range will be clamped.

   $color = Convert::Color::RGB->new( $string )
       Parses $string for values, and construct a new object similar to the above three-argument
       form. The string should be in the form

        red,green,blue

       containing the three floating-point values in decimal notation.

METHODS

   $r = $color->red
   $g = $color->green
   $b = $color->blue
       Accessors for the three components of the color.

   ( $red, $green, $blue ) = $color->rgb
       Returns the individual red, green and blue color components of the color value.

   $mix = $color->alpha_blend( $other, [ $alpha ] )
       Return a new color which is a blended combination of the two passed into it.  The optional
       $alpha parameter defines the mix ratio between the two colors, defaulting to 0.5 if not
       defined. Values closer to 0 will blend more of $color, closer to 1 will blend more of
       $other.

   $measure = $color->dst_rgb( $other )
       Return a measure of the distance between the two colors. This is the unweighted Euclidean
       distance of the three color components. Two identical colors will have a measure of 0,
       pure black and pure white have a distance of 1, and all others will lie somewhere
       inbetween.

   $measure = $color->dst_rgb_cheap( $other )
       Return a measure of the distance between the two colors. This is the sum of the squares of
       the differences of each of the color components. This is part of the value used to
       calculate "dst_rgb", but since it involves no square root it will be 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 colours and 3 for the
       distance between pure black and pure white.

EXAMPLES

   Generating Gradients
       The "alpha_blend" method can be used to generate a smooth gradient between two colours.

        use Convert::Color;

        my $blue = Convert::Color->new("vga:blue");
        my $cyan = Convert::Color->new("vga:cyan");

        say $blue->alpha_blend( $cyan, $_/10 )->as_rgb8->hex for 0 .. 10

SEE ALSO

       •   Convert::Color - color space conversions

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

       •   Convert::Color::HSL - a color value represented as hue/saturation/lightness

AUTHOR

       Paul Evans <leonerd@leonerd.org.uk>