Object
The properties :date_time, :date_time_original, :date_time_digitized coerced into Time objects.
The property :orientation describes the subject rotated and/or mirrored in relation to the camera. It is translated to one of the following instances:
TopLeftOrientation
TopRightOrientation
BottomRightOrientation
BottomLeftOrientation
LeftTopOrientation
RightTopOrientation
RightBottomOrientation
LeftBottomOrientation
These instances of Orientation have two methods:
to_i; return the original integer
transform_rmagick(image); transforms the given RMagick::Image to a viewable version
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 # => Rational(1, 100) EXIFR::TIFF.new('DSC_0218.TIF').orientation # => EXIFR::TIFF::Orientation
file is a filename or an IO object. Hint: use StringIO when working with slurped data like blobs.
# File lib/exifr/tiff.rb, line 341 def initialize(file) Data.open(file) do |data| @ifds = [IFD.new(data)] while ifd = @ifds.last.next break if @ifds.find{|i| i.offset == ifd.offset} @ifds << ifd end @jpeg_thumbnails = @ifds.map do |ifd| if ifd.jpeg_interchange_format && ifd.jpeg_interchange_format_length start, length = ifd.jpeg_interchange_format, ifd.jpeg_interchange_format_length data[start..(start + length)] end end.compact end end
Get index image.
# File lib/exifr/tiff.rb, line 369 def [](index) index.is_a?(Symbol) ? to_hash[index] : @ifds[index] end
Yield for each image.
# File lib/exifr/tiff.rb, line 364 def each @ifds.each { |ifd| yield ifd } end
Get GPS location, altitude and image direction return nil when not available.
# File lib/exifr/tiff.rb, line 415 def gps return nil unless gps_latitude && gps_longitude GPS.new(gps_latitude.to_f * (gps_latitude_ref == 'S' ? -1 : 1), gps_longitude.to_f * (gps_longitude_ref == 'W' ? -1 : 1), gps_altitude && (gps_altitude.to_f * (gps_altitude_ref == "\11"" ? -1 : 1)), gps_img_direction && gps_img_direction.to_f) end
Convenience method to access image height.
# File lib/exifr/tiff.rb, line 407 def height; @ifds.first.height; end
Dispatch to first image.
# File lib/exifr/tiff.rb, line 374 def method_missing(method, *args) super unless args.empty? if @ifds.first.respond_to?(method) @ifds.first.send(method) elsif TAGS.include?(method.to_s) @ifds.first.to_hash[method] else super end end
Number of images.
# File lib/exifr/tiff.rb, line 359 def size @ifds.size end
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