Section: User Contributed Perl Documentation (3)
Image::ExifTool::WritePNG.pl - Write PNG meta information
These routines are autoloaded by Image::ExifTool::PNG.
This file contains routines to write PNG
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
Copyright 2003-2019, Phil Harvey (phil at owl.phy.queensu.ca)
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.