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NAME - Write PNG meta information


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


       This file contains routines to write PNG metadata.


       Compress::Zlib is required to write compressed text.

       Existing text tags are always rewritten in their original form
       (compressed zTXt, uncompressed tEXt or internation 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).


       Copyright 2003-2014, Phil Harvey (phil at

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


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

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