= EXIF Reader
EXIF Reader is a module to read metadata from JPEG and TIFF images.

== Examples
  EXIFR::JPEG.new('IMG_6841.JPG').width               # => 2272
  EXIFR::JPEG.new('IMG_6841.JPG').height              # => 1704
  EXIFR::JPEG.new('IMG_6841.JPG').exif?               # => true
  EXIFR::JPEG.new('IMG_6841.JPG').model               # => "Canon PowerShot G3"
  EXIFR::JPEG.new('IMG_6841.JPG').date_time           # => Fri Feb 09 16:48:54 +0100 2007
  EXIFR::JPEG.new('IMG_6841.JPG').exposure_time.to_s  # => "1/15"
  EXIFR::JPEG.new('IMG_6841.JPG').f_number.to_f       # => 2.0

  EXIFR::TIFF.new('DSC_0218.TIF').width               # => 3008
  EXIFR::TIFF.new('DSC_0218.TIF')[1].width            # => 160
  EXIFR::TIFF.new('DSC_0218.TIF').model               # => "NIKON D1X"
  EXIFR::TIFF.new('DSC_0218.TIF').date_time           # => Tue May 23 19:15:32 +0200 2006
  EXIFR::TIFF.new('DSC_0218.TIF').exposure_time.to_s  # => "1/100"
  EXIFR::TIFF.new('DSC_0218.TIF').f_number.to_f       # => 5.0

  EXIFR::JPEG.new('enkhuizen.jpg').gps.latitude       # => 52.7197888888889
  EXIFR::JPEG.new('enkhuizen.jpg').gps.longitude      # => 5.28397777777778

== Logging warnings
When EXIF information is malformed, a warning is logged to STDERR with
the standard Ruby logger.  Log to some other location by supplying an
alternative implementation:

  EXIFR.logger = SyslogLogger.new

== Time zone support
EXIF does not support time zones so this code does not support time
zones.  All time stamps are created in the local time zone with:

  Time.local(..)

It is possible to change this behavior by supplying an alternative
implementation.  For those who prefer UTC:

  EXIFR::TIFF.mktime_proc = proc{|*args| Time.utc(*args)}

Or when the application depends on ActiveSupport for time zone handling:

  EXIFR::TIFF.mktime_proc = proc{|*args| Time.zone.local(*args)}

== XMP data access
If you need to access XMP data you can use the xmp gem.  More info and
examples at https://github.com/amberbit/xmp

== Author
R.W. van 't Veer

== Copyright
Copyright (c) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014 - R.W. van 't Veer