Convert::Color::RGB8(3pm)				User Contributed Perl Documentation				 Convert::Color::RGB8(3pm)

NAME

       "Convert::Color::RGB8" - a color value represented as red/green/blue in 8-bit integers

SYNOPSIS

       Directly:

	use Convert::Color::RGB8;

	my $red = Convert::Color::RGB8->new( 255, 0, 0 );

	# Can also parse strings
	my $pink = Convert::Color::RGB8->new( '255,192,192' );

	# or
	$pink = Convert::Color::RGB8->new( 'ffc0c0' );

       Via Convert::Color:

	use Convert::Color;

	my $cyan = Convert::Color->new( 'rgb8:0,255,255' );

DESCRIPTION

       Objects in this class represent a color in RGB space, as a set of three integer values in the range 0 to 255; i.e. as 8 bits.

       For representations using floating point values, see Convert::Color::RGB.  For representations using 16-bit integers, see
       Convert::Color::RGB16.

CONSTRUCTOR

   $color = Convert::Color::RGB8->new( $red, $green, $blue )
       Returns a new object to represent the set of values given. These values should be integers between 0 and 255. Values outside of this range
       will be clamped.

   $color = Convert::Color::RGB8->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 integer values in decimal notation. It can also be given in the form of a hex encoded string, such as would be
       returned by the "rgb8_hex" method:

	rrggbb

METHODS

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

   ( $red, $green, $blue ) = $color->rgb8
       Returns the individual red, green and blue color components of the color value in RGB8 space.

   $str = $color->hex
       Returns a string representation of the color components in the RGB8 space, in a convenient "RRGGBB" hex string, likely to be useful HTML,
       or other similar places.

   $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.

   $mix = $color->alpha8_blend( $other, [ $alpha ] )
       Similar to "alpha_blend" but works with integer arithmetic. $alpha should be an integer in the range 0 to 255.

   $measure = $color->dst_rgb8( $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_rgb8_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_rgb8", 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*(255^2) for the distance between pure black and pure white.

SEE ALSO

       o   Convert::Color - color space conversions

AUTHOR

       Paul Evans <leonerd@leonerd.org.uk>

perl v5.12.3							    2011-06-15						 Convert::Color::RGB8(3pm)