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.IX Title "Image::ExifTool::AFCP 3pm"
.TH Image::ExifTool::AFCP 3pm "2017-01-15" "perl v5.24.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Image::ExifTool::AFCP \- Read/write AFCP trailer
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
This module is used by Image::ExifTool
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module contains definitions required by Image::ExifTool to extract
information from the \s-1AFCP\s0 trailer.  Although the \s-1AFCP\s0 specification is
compatible with various file formats, ExifTool currently only processes \s-1AFCP\s0
in \s-1JPEG\s0 images.
.SH "NOTES"
.IX Header "NOTES"
\&\s-1AFCP\s0 is a specification which allows meta information (including \s-1IPTC\s0) to be
appended to the end of a file.
.PP
It is a poorly designed protocol because (like \s-1TIFF\s0) it uses absolute
offsets to specify data locations.  This is a huge blunder because it makes
the \s-1AFCP\s0 information dependent on the file length, so it is easily
invalidated by image editing software which doesn't recognize the \s-1AFCP\s0
trailer to fix up these offsets when the file length changes.  ExifTool will
attempt to fix these invalid offsets if possible.
.PP
Scanning for \s-1AFCP\s0 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 \s-1AFCP\s0 information.
.SH "AUTHOR"
.IX Header "AUTHOR"
Copyright 2003\-2017, Phil Harvey (phil at owl.phy.queensu.ca)
.PP
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
.SH "REFERENCES"
.IX Header "REFERENCES"
.IP "<http://www.tocarte.com/media/axs_afcp_spec.pdf>" 4
.IX Item "<http://www.tocarte.com/media/axs_afcp_spec.pdf>"
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\*(L"\s-1AFCP\s0 Tags\*(R" in Image::ExifTool::TagNames,
\&\fIImage::ExifTool\fR\|(3pm)