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convert::color::rgb16(3pm) [debian man page]

Convert::Color::RGB16(3pm)				User Contributed Perl Documentation				Convert::Color::RGB16(3pm)

"Convert::Color::RGB16" - a color value represented as red/green/blue in 16-bit integers SYNOPSIS
Directly: use Convert::Color::RGB16; my $red = Convert::Color::RGB16->new( 65535, 0, 0 ); # Can also parse strings my $pink = Convert::Color::RGB16->new( '65535,49152,49152' ); # or $pink = Convert::Color::RGB16->new( 'ffffc000c000' ); Via Convert::Color: use Convert::Color; my $cyan = Convert::Color->new( 'rgb16:0,65535,65535' ); DESCRIPTION
Objects in this class represent a color in RGB space, as a set of three integer values in the range 0 to 65535; i.e. as 16 bits. For representations using floating point values, see Convert::Color::RGB. For representations using 8-bit integers, see Convert::Color::RGB8. CONSTRUCTOR
$color = Convert::Color::RGB16->new( $red, $green, $blue ) Returns a new object to represent the set of values given. These values should be integers between 0 and 65535. Values outside of this range will be clamped. $color = Convert::Color::RGB16->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 "rgb16_hex" method: rrrrggggbbbb METHODS
$r = $color->red $g = $color->green $b = $color->blue Accessors for the three components of the color. ( $red, $green, $blue ) = $color->rgb16 Returns the individual red, green and blue color components of the color value in RGB16 space. $str = $color->hex Returns a string representation of the color components in the RGB16 space, in a convenient "RRRRGGGGBBBB" hex string. $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->alpha16_blend( $other, [ $alpha ] ) Similar to "alpha_blend" but works with integer arithmetic. $alpha should be an integer in the range 0 to 65535. $measure = $color->dst_rgb16( $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_rgb16_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_rgb16", 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*(65535^2) for the distance between pure black and pure white. SEE ALSO
o Convert::Color - color space conversions AUTHOR
Paul Evans <> perl v5.12.3 2011-06-15 Convert::Color::RGB16(3pm)

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Imager::Color::Float(3pm)				User Contributed Perl Documentation				 Imager::Color::Float(3pm)

Imager::Color::Float - Rough floating point sample color handling SYNOPSIS
$color = Imager::Color->new($red, $green, $blue); $color = Imager::Color->new($red, $green, $blue, $alpha); $color = Imager::Color->new("#C0C0FF"); # html color specification $color->set($red, $green, $blue); $color->set($red, $green, $blue, $alpha); $color->set("#C0C0FF"); # html color specification ($red, $green, $blue, $alpha) = $color->rgba(); @hsv = $color->hsv(); # not implemented but proposed $color->info(); DESCRIPTION
This module handles creating color objects used by Imager. The idea is that in the future this module will be able to handle color space calculations as well. A floating point Imager color consists of up to four components, each in the range 0.0 to 1.0. Unfortunately the meaning of the components can change depending on the type of image you're dealing with: o for 3 or 4 channel images the color components are red, green, blue, alpha. o for 1 or 2 channel images the color components are gray, alpha, with the other two components ignored. An alpha value of zero is fully transparent, an alpha value of 1.0 is fully opaque. METHODS
new This creates a color object to pass to functions that need a color argument. set This changes an already defined color. Note that this does not affect any places where the color has been used previously. rgba() This returns the red, green, blue and alpha channels of the color the object contains. info Calling info merely dumps the relevant color to the log. AUTHOR
Arnar M. Hrafnkelsson, And a great deal of help from others - see the "README" for a complete list. SEE ALSO
Imager(3), Imager::Color. perl v5.14.2 2011-06-06 Imager::Color::Float(3pm)
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