Imager::File::PNG - PNG File Format

This section provides a tutorial example on how to install Imager::File::PNG Perl module using CPAN Shell. Installation failed with 'lpng' library missing.



Note that the Perl Imager module only supports bmp, ico, pnm, raw, sgi and tga image file formats.

If you try to write an image in PNG file format, you will get an error:

herong$ perl Imager-Convert-Format.pl sample.png
format 'png' not supported - formats bmp, ico, pnm, raw, sgi, tga available
for reading - Can't locate Imager/File/PNG.pm
at Imager-Convert-Format.pl line 11.

To support PNG file format, you need to install the Imager::File::PNG module as suggested in the error message.

herong$ perl -MCPAN -e shell

cpan[1]> install Imager::File::PNG
Running install for module 'Imager::File::PNG'
Running make for T/TO/TONYC/Imager-File-PNG-0.94.tar.gz
Fetching with LWP:
http://cpan.mirrors.ovh.net/.../id/T/TO/TONYC/Imager-File-PNG-0.94.tar.gz
...
CPAN.pm: Building T/TO/TONYC/Imager-File-PNG-0.94.tar.gz
PNG: building independently
PNG: Generic: includes not found - libraries not found
...
PNG: base (+libz): includes not found - libraries not found
...
PNG: Checking if the compiler can find them on its own
Warning (mostly harmless): No library found for -lpng

PNG: Test code failed: Can't link/include 'png.h', 'stdio.h', 'png'
OS unsupported: PNG libraries or headers not found
Warning: No success on command[/usr/bin/perl Makefile.PL]
'YAML' not installed, will not store persistent state
  TONYC/Imager-File-PNG-0.94.tar.gz
  /usr/bin/perl Makefile.PL -- NOT OK
Running make test
  Make had some problems, won't test
Running make install
  Make had some problems, won't install

Looks like the required "lpng" library is missing. So installation of Imager::File::PNG failed.



 

Table of Contents

 About This Book

 Perl on Linux Systems

 ActivePerl on Windows Systems

 Data Types: Values and Variables

 Expressions, Operations and Simple Statements

 User Defined Subroutines

 Perl Built-in Debugger

 Name Spaces and Perl Module Files

 Symbolic (or Soft) References

 Hard References - Addresses of Memory Objects

 Objects (or References) and Classes (or Packages)

 Typeglob and Importing Identifiers from Other Packages

 String Built-in Functions and Performance

 File Handles and Data Input/Output

 Open Files in Binary Mode

 Open Directories and Read File Names

 File System Functions and Operations

Image and Picture Processing

 Imager - Create and Save Image

 Imager - Draw Graphical Elements

 Imager - Convert Image File Format

Imager::File::PNG - PNG File Format

 Install LIBPNG from Source Code

 Install Imager::File::PNG Manually

 Install PerlMagick from Source Code

 Using DBM Database Files

 Using MySQL Database Server

 Socket Communication Over the Internet

 XML::Simple Module - XML Parser and Generator

 XML Communication Model

 SOAP::Lite - SOAP Server-Client Communication Module

 Perl Programs as IIS Server CGI Scripts

 CGI (Common Gateway Interface)

 XML-RPC - Remote Procedure Call with XML and HTTP

 RPC::XML - Perl Implementation of XML-RPC

 Integrating Perl with Apache Web Server

 CGI.pm Module for Building Web Pages

 LWP::UserAgent and Web Site Testing

 Converting Perl Script to Executable Binary

 Managing Perl Engine and Modules on macOS

 References

 Full Version in PDF/EPUB