imager::transform(3pm) [debian man page]

Imager::Transform(3pm)					User Contributed Perl Documentation				    Imager::Transform(3pm)

NAME

	 Imager::Transform - a library of register machine image transformations

SYNOPSIS

	 # get a list of transformations
	 my @funcs = Imager::Transform->list;
	 # create a transformation object
	 my $tran = Imager::Transform->new($name);
	 # describe it
	 print $tran->describe;
	 # a list of constant names
	 my @constants = $tran->constants;
	 # information about some of the constants
	 my @info = $tran->constants(@constants);

DESCRIPTION

       This module provides a library of transformations that use the Imager transform2() function.

       The aim is to provide a place to collect these transformations.

       At some point there might be an interface to add new functions, but there's not a whole lot of point to that.

       The interface is a little sparse as yet.

METHODS

       my @names = Imager::Transform->list
	   Returns a list of the transformations.

       my $desc = Imager::Transform->describe($name);
       my $desc = $tran->describe()
	   Describes a transformation specified either by name (as a class method) or by reference (as an instance method).

	   The class method returns undef if there is no such transformation.

       my $tran = Imager::Transform->new($name)
	   Create a new transformation object.	Returns undef if there is no such transformation.

       my @inputs = $tran->inputs;
       my $inputs = $tran->inputs;
	   Returns a list of input image descriptions, or the number of them, depending on content.

	   The list contains hash references, which current contain only one member, "desc", a description of the use of the input image.

       $tran->constants
	   Returns a list of names of constants that can be set for the transformation.

       $tran->constants($name, $name, ...)
	   Returns a hashref for each named constant, which contains the default in key "default" and a description in key "desc".

       my $out = $tran->transform(\%opts, \%constants, @imgs)
	   Perform the image transformation.

	   Returns the new image on success, or undef on failure, in which case you can use $tran->errstr to get an error message.

       $tran->errstr
	   The error message, if any from the last image transformation.

BUGS

       Needs more transformations.

SEE ALSO

       Imager(3), transform.perl

perl v5.14.2							    2011-06-06						    Imager::Transform(3pm)

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

NAME

       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, addi@umich.edu And a great deal of help from others - see the "README" for a complete list.

SEE ALSO

       Imager(3), Imager::Color.

       http://imager.perl.org/

perl v5.14.2							    2011-06-06						 Imager::Color::Float(3pm)

Linux and UNIX Man Pages

imager::transform(3pm) [debian man page]

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