DRAFT: eXIF 2017-03-05

DRAFT
eXIf 2017-03-05
http://www.simplesystems.org/png-group/proposals/eXIf/
png-proposed-eXIf-chunk-03-05.html
Glenn Randers-Pehrson <[email protected]>

Revised this paragraph to read

The data segment of the eXIf chunk contains an Exif profile in the
format specified in "4.7.2 Interoperability Structure of APP1 in
Compressed Data" of [CIPA DC-008-2016] except that the JPEG APP1
marker, length, and the "Exif ID code" described in 4.7.2(C), i.e.,
"Exif", NULL, and padding byte, are not included.  Therefore, it
begins with either "II" or "MM", depending upon the byte order used,
and it contains a TIFF header plus a 0th IFD (Image File Directory)
and a 1st IFD; the 0th IFD contains pointers to an Exif IFD and/or a
GPS IFD; and the 1st IFD contains a thumbnail image.  Any IFD may be
omitted.  Any gap preceding an IFD is filled with padding bytes of
unspecified content.

Glenn

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