Class: EXIFR::TIFF
Overview
TIFF decoder
Date properties
The properties :date_time
, :date_time_original
, :date_time_digitized
coerced into Time objects.
Orientation
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
Examples
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
Defined Under Namespace
Classes: Data, Degrees, Field, GPS, IFD, Orientation
Constant Summary collapse
- TAG_MAPPING =
:nodoc:
{}
- IFD_TAGS =
:nodoc:
[:image, :exif, :gps]
- ORIENTATIONS =
:nodoc:
[]
- ADAPTERS =
:nodoc:
Hash.new { proc { |v| v } }
- TAGS =
Names for all recognized TIFF fields.
[TAG_MAPPING.keys, TAG_MAPPING.values.map{|v|v.values}].flatten.uniq - IFD_TAGS
Class Attribute Summary collapse
-
.mktime_proc ⇒ Object
Callable to create a
Time
object.
Instance Attribute Summary collapse
-
#jpeg_thumbnails ⇒ Object
readonly
JPEG thumbnails.
Class Method Summary collapse
-
.instance_methods(include_super = true) ⇒ Object
:nodoc:.
- .instance_methods_without_tiff_extras ⇒ Object
- .rational(n, d) ⇒ Object
- .round(f, n) ⇒ Object
Instance Method Summary collapse
-
#[](index) ⇒ Object
Get
index
image. -
#each ⇒ Object
Yield for each image.
-
#gps ⇒ Object
Get GPS location, altitude and image direction return nil when not available.
-
#height ⇒ Object
Convenience method to access image height.
-
#initialize(file) ⇒ TIFF
constructor
file
is a filename or anIO
object. -
#inspect ⇒ Object
:nodoc:.
-
#method_missing(method, *args) ⇒ Object
Dispatch to first image.
-
#methods ⇒ Object
:nodoc:.
-
#respond_to?(method, include_all = false) ⇒ Boolean
:nodoc:.
-
#size ⇒ Object
Number of images.
-
#to_hash ⇒ Object
Get a hash presentation of the (first) image.
-
#width ⇒ Object
Convenience method to access image width.
Constructor Details
#initialize(file) ⇒ TIFF
file
is a filename or an IO
object. Hint: use StringIO
when working with slurped data like blobs.
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# File 'lib/exifr/tiff.rb', line 372 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 |
Dynamic Method Handling
This class handles dynamic methods through the method_missing method
#method_missing(method, *args) ⇒ Object
Dispatch to first image.
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# File 'lib/exifr/tiff.rb', line 405 def method_missing(method, *args) super unless args.empty? if @ifds.first.respond_to?(method) @ifds.first.send(method) elsif TAGS.include?(method) @ifds.first.to_hash[method] else super end end |
Class Attribute Details
.mktime_proc ⇒ Object
Callable to create a Time
object. Defaults to proc{|*a|Time.local(*a)}
.
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# File 'lib/exifr/tiff.rb', line 243 def mktime_proc @mktime_proc end |
Instance Attribute Details
#jpeg_thumbnails ⇒ Object (readonly)
JPEG thumbnails
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# File 'lib/exifr/tiff.rb', line 43 def jpeg_thumbnails @jpeg_thumbnails end |
Class Method Details
.instance_methods(include_super = true) ⇒ Object
:nodoc:
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# File 'lib/exifr/tiff.rb', line 429 def instance_methods(include_super = true) # :nodoc: (instance_methods_without_tiff_extras(include_super) + TAGS + IFD.instance_methods(false)).uniq end |
.instance_methods_without_tiff_extras ⇒ Object
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# File 'lib/exifr/tiff.rb', line 428 alias instance_methods_without_tiff_extras instance_methods |
.rational(n, d) ⇒ Object
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# File 'lib/exifr/tiff.rb', line 339 def self.rational(n, d) if d == 0 n.to_f / d.to_f elsif Rational.respond_to?(:reduce) Rational.reduce(n, d) else n.quo(d) end end |
.round(f, n) ⇒ Object
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# File 'lib/exifr/tiff.rb', line 349 def self.round(f, n) q = (10 ** n) (f * q).round.to_f / q end |
Instance Method Details
#[](index) ⇒ Object
Get index
image.
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# File 'lib/exifr/tiff.rb', line 400 def [](index) index.is_a?(Symbol) ? to_hash[index] : @ifds[index] end |
#each ⇒ Object
Yield for each image.
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# File 'lib/exifr/tiff.rb', line 395 def each @ifds.each { |ifd| yield ifd } end |
#gps ⇒ Object
Get GPS location, altitude and image direction return nil when not available.
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# File 'lib/exifr/tiff.rb', line 446 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 == "\1" ? -1 : 1)), gps_img_direction && gps_img_direction.to_f) end |
#height ⇒ Object
Convenience method to access image height.
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# File 'lib/exifr/tiff.rb', line 438 def height; @ifds.first.height; end |
#inspect ⇒ Object
:nodoc:
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# File 'lib/exifr/tiff.rb', line 454 def inspect # :nodoc: @ifds.inspect end |
#methods ⇒ Object
:nodoc:
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# File 'lib/exifr/tiff.rb', line 423 def methods # :nodoc: (super + TAGS + IFD.instance_methods(false)).uniq end |
#respond_to?(method, include_all = false) ⇒ Boolean
:nodoc:
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# File 'lib/exifr/tiff.rb', line 417 def respond_to?(method, include_all = false) # :nodoc: super || (defined?(@ifds) && @ifds && @ifds.first && @ifds.first.respond_to?(method, include_all)) || TAGS.include?(method) end |
#size ⇒ Object
Number of images.
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# File 'lib/exifr/tiff.rb', line 390 def size @ifds.size end |
#to_hash ⇒ Object
Get a hash presentation of the (first) image.
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# File 'lib/exifr/tiff.rb', line 441 def to_hash; @ifds.first.to_hash; end |
#width ⇒ Object
Convenience method to access image width.
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# File 'lib/exifr/tiff.rb', line 435 def width; @ifds.first.width; end |