DRAFT: eXIf 2017-03-02

DRAFT
eXIf 2017-03-02
http://www.simplesystems.org/png-group/proposals/eXIf/
png-proposed-eXIf-chunk-2017-03-02.html
Glenn Randers-Pehrson <[email protected]>


This draft has two new paragraphs:

> It contains a TIFF header plus a 0th IFD (Image File Directory)
> and/or a 1st IFD as defined in the Exif specification; the 0th IFD
> contains pointers to an Exif sub-IFD and/or a GPS sub-IFD. The
> optional 1st IFD contains a thumbnail image.

> While the PNG specification allows the chunk size to be as large as
> 2^31-1 bytes, encoders should be aware that, if the Exif profile is
> converted to JPEG, the total length of the Exif data (the sum of the
> lengths of the Exif attributes IFD, the GPS IFD, the thumbnail IFD, and
> the TIFF header) must not exceed 64 kbytes, because it must fit into
> a JPEG APP1 marker.

Glenn

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