EXIF Reader is a module to read metadata from JPEG and TIFF images.
require 'exifr/jpeg'
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::JPEG.new('enkhuizen.jpg').gps.latitude # => 52.7197888888889
EXIFR::JPEG.new('enkhuizen.jpg').gps.longitude # => 5.28397777777778
require 'exifr/tiff'
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 # => 5.0When 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.newEXIF 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)}If you need to access XMP data you can use the xmp gem. More info and examples at https://github.com/amberbit/xmp
On a fresh checkout of the repository, run bundle install and then
bundle exec rake test.
R.W. van 't Veer
Copyright (c) 2006-2023 - R.W. van 't Veer