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)
Check Out this Related Man Page
Imager::Inline(3pm) User Contributed Perl Documentation Imager::Inline(3pm)NAME
Imager::Inline - using Imager with Inline::C.
SYNOPSIS
use Inline with => 'Imager';
use Inline C => <<'EOS';
Imager some_func(Imager::Color c, Imager::Fill f) {
Imager img = i_img_8_new(200, 200, 3);
/* fill with color */
i_box_filled(img, 0, 0, 199, 199, c);
/* inner area with fill */
i_box_cfill(img, 50, 50, 149, 149, f);
return img;
}
EOS
DESCRIPTION
Imager hooks into Inline's "with" syntax to make it easier to write Inline::C code that works with Imager, you can call Imager functions
without having to include headers or perform initialization.
Imager's Inline "with" support does the following:
o add the installed Imager include directory to INC
o add the Imager typemap to TYPEMAPS
o include the headers needed by Imager C extension modules.
o declare and initialize the Imager API function table pointer
o filter the supplied code to replace Imager's class names with those that Inline::C can handle.
LIMITATIONS
The filtering mechanism is global, it will replace the class names even inside string constants. If you need a string matching the name of
one of Imager's classes, like "Imager::Color" you will need to split it into 2 to use C's string pasting mechanism, for example: "Imager:"
":Color".
AUTHOR
Tony Cook <tonyc@cpan.org>
REVISION
$Revision$
SEE ALSO
Imager, Imager::ExtUtils, Imager::API, Imager::APIRef, samples/inline_replace_color.pl
perl v5.14.2 2011-06-06 Imager::Inline(3pm)
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