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 2003-2018, 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)