Image::ExifTool::WritePNG(3)               User Contributed Perl Documentation


NAME
       Image::ExifTool::WritePNG.pl - Write PNG meta information

SYNOPSIS
       These routines are autoloaded by Image::ExifTool::PNG.

DESCRIPTION
       This file contains routines to write PNG metadata.

NOTES
       Compress::Zlib is required to write compressed text.

       Existing text tags are always rewritten in their original form
       (compressed zTXt, uncompressed tEXt or international iTXt), so
       pre-existing compressed information can only be modified if
       Compress::Zlib is available.

       Newly created textual information is written in uncompressed tEXt form
       by default, or as compressed zTXt if the Compress option is used and
       Compress::Zlib is available (but only if the resulting compressed data
       is smaller than the original text, which isn't always the case for
       short text strings).

AUTHOR
       Copyright 2003-2026, Phil Harvey (philharvey66 at gmail.com)

       This library is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.

SEE ALSO
       Image::ExifTool::PNG(3pm), Image::ExifTool(3pm)

perl v5.42.1                      2026-04-07      Image::ExifTool::WritePNG(3)