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Image::ExifTool::AFCP(User Contributed Perl DocumentatImage::ExifTool::AFCP(3)

NAME
       Image::ExifTool::AFCP - Read/write AFCP trailer

SYNOPSIS
       This module is used by Image::ExifTool

DESCRIPTION
       This module contains definitions	required by Image::ExifTool to extract
       information from	the AFCP trailer.  Although the	AFCP specification is
       compatible with various file formats, ExifTool currently	only processes
       AFCP in JPEG images.

NOTES
       AFCP is a specification which allows meta information (including	IPTC)
       to be appended to the end of a file.

       It is a poorly designed protocol	because	(like TIFF) it uses absolute
       offsets to specify data locations.  This	is a huge blunder because it
       makes the AFCP information dependent on the file	length,	so it is
       easily invalidated by image editing software which doesn't recognize
       the AFCP	trailer	to fix up these	offsets	when the file length changes.
       ExifTool	will attempt to	fix these invalid offsets if possible.

       Scanning	for AFCP information may be time consuming, especially when
       reading from a sequential device, since the information is at the end
       of the file.  In	these instances, the ExifTool FastScan option may be
       used to disable scanning	for AFCP information.

AUTHOR
       Copyright 2003-2017, 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.

REFERENCES
       <http://www.tocarte.com/media/axs_afcp_spec.pdf>

SEE ALSO
       "AFCP Tags" in Image::ExifTool::TagNames, Image::ExifTool(3pm)

perl v5.32.0			  2017-01-03	      Image::ExifTool::AFCP(3)

NAME | SYNOPSIS | DESCRIPTION | NOTES | AUTHOR | REFERENCES | SEE ALSO

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