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Imager - Perl extension for Generating 24 bit Images

• NAME
• SYNOPSIS
• DESCRIPTION
• Overview of documentation
• Basic Overview
• SUPPORT
• BUGS
• AUTHOR
• SEE ALSO

NAME

Imager - Perl extension for Generating 24 bit Images

SYNOPSIS

  # Thumbnail example

  #!/usr/bin/perl -w
  use strict;
  use Imager;

  die "Usage: thumbmake.pl filename\n" if !-f $ARGV[0];
  my $file = shift;

  my $format;

  my $img = Imager->new();
  $img->open(file=>$file) or die $img->errstr();

  $file =~ s/\.[^.]*$//;

  # Create smaller version
  my $thumb = $img->scale(scalefactor=>.3);

  # Autostretch individual channels
  $thumb->filter(type=>'autolevels');

  # try to save in one of these formats
  SAVE:

  for $format ( qw( png gif jpg tiff ppm ) ) {
    # Check if given format is supported
    if ($Imager::formats{$format}) {
      $file.="_low.$format";
      print "Storing image as: $file\n";
      $thumb->write(file=>$file) or
        die $thumb->errstr;
      last SAVE;
    }
  }

DESCRIPTION

Imager is a module for creating and altering images. It can read and write various image formats, draw primitive shapes like lines,and polygons, blend multiple images together in various ways, scale, crop, render text and more.

Overview of documentation

Imager

This document - Synopsis Example, Table of Contents and Overview.

Imager::ImageTypes

Basics of constructing image objects with new(): Direct type/virtual images, RGB(A)/paletted images, 8/16/double bits/channel, color maps, channel masks, image tags, color quantization. Also discusses basic image information methods.

Imager::Files

IO interaction, reading/writing images, format specific tags.

Imager::Draw

Drawing Primitives, lines, boxes, circles, arcs, flood fill.

Imager::Color

Color specification.

Imager::Fill

Fill pattern specification.

Imager::Font

General font rendering, bounding boxes and font metrics.

Imager::Transformations

Copying, scaling, cropping, flipping, blending, pasting, convert and map.

Imager::Engines

Programmable transformations through transform(), transform2() and matrix_transform().

Imager::Filters

Filters, sharpen, blur, noise, convolve etc. and filter plugins.

Imager::Expr

Expressions for evaluation engine used by transform2().

Imager::Matrix2d

Helper class for affine transformations.

Imager::Fountain

Helper for making gradient profiles.

Basic Overview

An Image object is created with $img = Imager->new(). Examples:

  $img=Imager->new();                         # create empty image
  $img->open(file=>'lena.png',type=>'png') or # read image from file
     die $img->errstr();                      # give an explanation
                                              # if something failed

or if you want to create an empty image:

  $img=Imager->new(xsize=>400,ysize=>300,channels=>4);

This example creates a completely black image of width 400 and height 300 and 4 channels.

When an operation fails which can be directly associated with an image the error message is stored can be retrieved with $img->errstr().

In cases where no image object is associated with an operation $Imager::ERRSTR is used to report errors not directly associated with an image object.

The Imager->new method is described in detail in the Imager::ImageTypes manpage.

SUPPORT

You can ask for help, report bugs or express your undying love for Imager on the Imager-devel mailing list.

To subscribe send a message with subscribe in the body to:

   imager-devel+request@molar.is

or use the form at:

   http://www.molar.is/en/lists/imager-devel/
   (annonymous is temporarily off due to spam)

where you can also find the mailing list archive.

If you're into IRC, you can typically find the developers in #Imager on irc.rhizomatic.net. As with any IRC channel, the participants could be occupied or asleep, so please be patient.

BUGS

Bugs are listed individually for relevant pod pages.

AUTHOR

Arnar M. Hrafnkelsson (addi@imager.perl.org) and Tony Cook (tony@imager.perl.org) See the README for a complete list.

SEE ALSO

perl(1), Imager::ImageTypes(3), Imager::Files(3), Imager::Draw(3), Imager::Color(3), Imager::Fill(3), Imager::Font(3), Imager::Transformations(3), Imager::Engines(3), Imager::Filters(3), Imager::Expr(3), Imager::Matrix2d(3), Imager::Fountain(3)

Affix::Infix2Postfix(3), Parse::RecDescent(3) http://imager.perl.org/~addi/perl/Imager/

Information