# Image::ExifTool::AFCP - phpMan

## 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)]