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Convert::Color::RGB8(3User Contributed Perl DocumentatiConvert::Color::RGB8(3)

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
       ยท   Convert::Color - color space conversions

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

perl v5.14.0			  2011-06-19	       Convert::Color::RGB8(3)
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