phpman > perldoc > Image::ExifTool::AFCP(3pm)

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 2003-2022, 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.

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

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