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GD::Convert is a Perl module with additional output formats for GD.

SYNOPSIS

use GD;
use GD::Convert qw(gif=gif_netpbm newFromGif=newFromGif_imagemagick wbmp);
# or:
require GD::Convert;
import GD::Convert;
...
$gd->ppm;
$gd->xpm;
$gd->gif;
$gd->wbmp;
...
$gd = GD::Image->newFromPpmData(...);
$gd = GD::Image->newFromGif(...);

This module provides additional output methods for the GD module: ppm, xpm, wbmp, gif_netpbm and gif_imagemagick, and also additional constructors: newFromPpm, newFromPpmData, newFromGif_netpbm, newFromGifData_netpbm, newFromGif_imagemagick, newFromGifData_imagemagick.

The new methods go into the GD namespace.

For convenience, it is possible to set shorter names for the gif, newFromGif and newFromGifData methods by providing one of the following strings in the import list:

gif=gif_netpbm
newFromGif=newFromGif_netpbm
newFromGifData=newFromGifData_netpbm

Use external commands from netpbm to load and create GIF images.

gif=gif_imagemagick
newFromGif=newFromGif_imagemagick
newFromGifData=newFromGifData_imagemagick

Use external commands from imagemagick to load and create GIF images.

gif=any
newFromGif=any
newFromGifData=any

Use any of the above methods to load and create GIF images.

wbmp

Create wbmp images. Only necessary for GD before version 1.26, but it does not hurt if it is included with newer GD versions.

The new methods and constructors:

$ppmdata = $image->ppm

Take a GD image and return a string with a PPM file as its content.

$xpmdata = $image->xpm

Take a GD image and return a string with a XPM file as its content.

$gifdata = $image->gif_netpbm([...])

Take a GD image and return a string with a GIF file as its content. The conversion will use the ppmtogif binary from netpbm. Make sure that ppmtogif is actually in your PATH. If you specify gif=gif_netpbm in the use line, then you can use the method name gif instead.

The gif_netpbm handles the optional parameter -transparencyhack. If set to a true value, a transparent GIF file will be produced. Note that this will not work if the transparent color occurs also as a normal color.

$gifdata = $image->gif_imagemagick

This is the same as gif_netpbm, instead it is using the convert program of ImageMagick.

$image = GD::Image->newFromPpm($file, [$truecolor])

Create a GD image from the named ppm file or filehandle reference. Only raw ppm files (signature P6) are supported.

$image = GD::Image->newFromPpmData($data, [$truecolor])

Create a GD image from the data string containing ppm data. Only raw ppm files are supported.

$image = GD::Image->newFromGif_netpbm($file, [$truecolor]);

Create a GD image from the named file or filehandle reference using external netpbm programs.

$image = GD::Image->newFromGifData_netpbm($file, [$truecolor]);

Create a GD image from the data string using external netpbm programs.

$image = GD::Image->newFromGif_imagemagick($file, [$truecolor]);

Create a GD image from the named file or filehandle reference using external ImageMagick programs.

$image = GD::Image->newFromGifData_imagemagick($file, [$truecolor]);

Create a GD image from the data string using external ImageMagick programs.

You can set the variable $GD::Convert::DEBUG to a true value to get some information about external commands used while converting.

Convert::PEM is Perl module that read/write encrypted ASN.1 PEM files.

SYNOPSIS

use Convert::PEM;
my $pem = Convert::PEM->new(
Name => "DSA PRIVATE KEY",
ASN => qq(
DSAPrivateKey SEQUENCE {
version INTEGER,
p INTEGER,
q INTEGER,
g INTEGER,
pub_key INTEGER,
priv_key INTEGER
}
));

my $pkey = $pem->read(
Filename => $keyfile,
Password => $pwd
);

$pem->write(
Content => $pkey,
Password => $pwd,
Filename => $keyfile
);

Convert::PEM reads and writes PEM files containing ASN.1-encoded objects. The files can optionally be encrypted using a symmetric cipher algorithm, such as 3DES. An unencrypted PEM file might look something like this:

-----BEGIN DH PARAMETERS-----
MB4CGQDUoLoCULb9LsYm5+/WN992xxbiLQlEuIsCAQM=
-----END DH PARAMETERS-----

The string beginning MB4C... is the Base64-encoded, ASN.1-encoded "object."
An encrypted file would have headers describing the type of encryption used, and the initialization vector:

-----BEGIN DH PARAMETERS-----
Proc-Type: 4,ENCRYPTED
DEK-Info: DES-EDE3-CBC,C814158661DC1449

AFAZFbnQNrGjZJ/ZemdVSoZa3HWujxZuvBHzHNoesxeyqqidFvnydA==
-----END DH PARAMETERS-----

The two headers (Proc-Type and DEK-Info) indicate information about the type of encryption used, and the string starting with AFAZ... is the Base64-encoded, encrypted, ASN.1-encoded contents of this "object."

The initialization vector (C814158661DC1449) is chosen randomly.

Convert::ASN1 is an ASN.1 Encode/Decode library.

SYNOPSYS

use Convert::ASN1;

$asn = Convert::ASN1->new;
$asn->prepare(q<

[APPLICATION 7] SEQUENCE {
int INTEGER,
str OCTET STRING
}

>);

$pdu = $asn->encode( int => 7, str => "string");

$out = $asn->decode($pdu);
print $out->{int}," ",$out->{str},"n";

use Convert::ASN1 qw(:io);

$peer = asn_recv($sock,$buffer,0);
$nbytes = asn_read($fh, $buffer);
$nbytes = asn_send($sock, $buffer, $peer);
$nbytes = asn_send($sock, $buffer);
$nbytes = asn_write($fh, $buffer);
$buffer = asn_get($fh);
$yes = asn_ready($fh)

Convert::ASN1 encodes and decodes ASN.1 data structures using BER/DER rules.

ImageConverter is able to convert one image type (example:gif) to another type (example:jpeg).

ImageConverter application uses ImageMagick to conver the images!

convert2tifgrayscale is a GIMP plugin that can batch convert to tif grayscale for Offset-Printing.

Converts all images in a specified directory to grayscale, then uses unsharp mask and adjusts levels.

Convert::UUlib is a Perl interface to the uulib library (a.k.a. uudeview/uuenview).

SYNOPSIS

use Convert::UUlib :all;

# read all the files named on the commandline and decode them
# into the CURRENT directory. See below for a longer example.
LoadFile $_ for @ARGV;
for (my $i = 0; my $uu = GetFileListItem $i; $i++) {
if ($uu->state & FILE_OK) {
$uu->decode;
print $uu->filename, "n";
}
}

Read the file doc/library.pdf from the distribution for in-depth information about the C-library used in this interface, and the rest of this document and especially the non-trivial decoder program at the end.