A couple of years ago I ported the libexif C headers to D for a hobby project.  The project itself never went anywhere, but I did complete the bindings.  I have cleaned them up a bit and uploaded them to Deimos in the hope that they may be useful for someone else:

  https://github.com/D-Programming-Deimos/libexif

libexif is a freely available (LGPL) library for reading and writing EXIF metadata from and to image files.  For more information, see the libexif home page,

    http://libexif.sourceforge.net/

or the Wikipedia page on the EXIF format:

    https://en.wikipedia.org/wiki/Exif

-Lars