Class: PhotoUtils::Tools::Compare

Inherits:
PhotoUtils::Tool show all
Defined in:
lib/photo_utils/tools/compare.rb

Instance Method Summary collapse

Methods inherited from PhotoUtils::Tool

#description, #initialize, #name, #usage

Constructor Details

This class inherits a constructor from PhotoUtils::Tool

Instance Method Details

#run ⇒ Object 



12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
 
# File 'lib/photo_utils/tools/compare.rb', line 12

def run
  # given:
  #   an image file with EXIF data
  #     extract:
  #       aperture/speed/sensitivity/bias
  #       format (eg, APS-C)
  #       lens focal length (in that format)
  #       post-process exposure adjustment (from XMP data)
  #     estimate width/height
  #     desired minimum shutter
  #  calculate
  #    Ev100
  #    subject distance
  #    depth of field
  #    height or width (not given)
  #    focal length required in 35mm
  #    aperture required for equivalent depth of field
  #    (warn if shutter changes)
  #
  # scenes:
  #   stage performance at medium / far
  #   portrait at close / medium

  #FIXME: Ugh

  $min_sensitivity = Sensitivity.new(100)
  $max_sensitivity = Sensitivity.new(1600)
  $max_angle_of_view_delta = Angle.new(5)
  $max_subject_distance_delta = 6.feet

  base = Path.new('/Users/johnl/Pictures/Lightroom Burned Exports')

  shots = %q{

    # file                        width DoF   description

    3787022130_ce334b0c20_o.jpg   56"   3'    OCF poem typist: W/A closeup
    3894979751_8ef3683c78_o.jpg   54"   3'    OCF poem typist: medium
    3711708327_917d493f1a_o.jpg   23"   1'    OCF man with hat: torso
    58970238_dfe52a2c77_o.jpg     96"   3'    backlit dancer: medium from medium
    3043470502_9b3406f4dd_o.jpg   81"   3'    winged stripper
    3084813136_180bda6d84_o.jpg   75"   3'    stripper moving away: close from close
    IMG_2664.jpg                  233"  10'   yarddogs dancers: wide from far
    IMG_2672.jpg                  95"   10'   yarddogs horns: medium from far
    IMG_2864.jpg                  49"   2'    sideshow bug eating: close from near
    IMG_2790.jpg                  63"   3'    sideshow ass: medium from near

    060512.031.jpg                233"  6'    Japan: man on street at night
    060512.051.jpg                150'  50'   Japan: Tokyo cityscape
    060512.139.jpg                15'   10'   Japan: man in street
    060514.058.jpg                4'    1'    Japan: bookstore
    060515.081.jpg                7'    4'    Japan: plants at corner
    060519.001.jpg                14"   3"    Japan: eggs
    060520.012.jpg                20'   10'   Japan: haystack
    060524.023.jpg                9'    3'    Japan: plants & rust
    060527.051.jpg                8'    3'    Japan: racoon & bicycle
    060528.003.jpg                18"   6"    Japan: tiny buddhas

  }.split(/\n/).map { |line|
    line.gsub!(/^\s+|\s+$/, '')
    line.sub!(/#.*/, '')
    if line.empty?
      nil
    else
      file, width, dof, type = line.split(/\s+/, 4)
        dof = Length.new(dof)
      width = Length.new(width)
      HashStruct.new(
        type: type,
        file: file,
        subject_width: width,
        desired_dof: dof)
    end
  }.compact

  # FIXME: Ugh

  def validate(scene, camera, lens, subject_distance_delta, angle_of_view_delta)

    #
    # validate subject distance delta
    #

    if subject_distance_delta > $max_subject_distance_delta
      raise "subject distance delta too different (#{subject_distance_delta.to_s(:imperial)} > #{$max_subject_distance_delta.to_s(:imperial)})"
    end

    #
    # validate aperture
    #

    if scene.aperture > lens.min_aperture || scene.aperture < lens.max_aperture
      raise "aperture out of range (#{scene.aperture} != #{lens.max_aperture} .. #{lens.min_aperture})"
    end

    #
    # validate angle of view
    #

    if angle_of_view_delta > $max_angle_of_view_delta
      raise "angle of view too different (#{angle_of_view_delta} > #{$max_angle_of_view_delta})"
    end

    # if scene.angle_of_view - scene.angle_of_view > 5
    #   raise "angle of view too wide (#{scene2.angle_of_view} > #{scene.angle_of_view})"
    #   next
    # end

    #
    # validate shutter
    #

    if scene.time > camera.max_shutter
      raise "shutter too slow (#{scene.time} < #{camera.max_shutter})"
    end

  end

  successes = {}

  shots.each do |shot|

    img = MiniExiftool.new(base + shot.file, numerical: true, timestamps: DateTime)

    scene = Scene.new

    model = img['Model']
    scene.format = Format[model] or raise "Can't determine frame for model #{model.inspect} (#{shot.file})"

    scene.description = "#{shot[:type]} [#{shot[:seq]}]"
    scene.aperture = img['Aperture']
    if img['ISO'].kind_of?(Numeric)
      scene.sensitivity = img['ISO']
    else # "0 800"
      scene.sensitivity = img['ISO'].split(' ').last.to_f
    end
    scene.time = img['ExposureTime']
    scene.focal_length = img['FocalLength']

    exp_comp = img['ExposureCompensation'].to_f
    if exp_comp != 0
      scene.sensitivity = Sensitivity.new_from_v(scene.sensitivity.to_v + exp_comp)
    end

    # d = w * f / s
    scene.subject_distance = Length.new(shot.subject_width * (scene.focal_length / scene.format.width))

    puts
    puts "--- #{scene.description}"
    puts

    scene.print_exposure
    scene.print_depth_of_field
    puts

    # now compute equivalent scene for each camera

    cameras.each do |camera|

      scene2 = Scene.new
      scene2.format = camera.format or raise "Unknown format: #{camera.format.inspect}"
      scene2.aperture = scene.aperture
      scene2.brightness = scene.brightness
      # scene2.sensitivity = 400

      # find the lens that would best fit

      found = false

      # NOTE: #uniq doesn't work well with delegate classes, so we cast the focal length to a float first
      focal_lengths = camera.lenses.collect { |lens| lens.focal_length.to_f }.sort.reverse.uniq

      focal_lengths.each do |focal_length|

        lenses = camera.lenses.select { |lens| lens.focal_length == focal_length }.sort_by { |lens| lens.max_aperture }.reverse

        lenses.each do |lens|

          scene2.focal_length = lens.focal_length

          # keeping subject width the same, compute new distance from given focal length

          #    o     i
          #   --- = ---
          #    d     f
          #
          # f = focal length
          # d = subject distance
          # o = subject dimension
          # i = frame dimension

          scene2.subject_distance = 1 / ((scene2.frame.width / scene2.focal_length) / shot.subject_width)

          #
          # calculate depth of field
          #

          near_limit = scene2.subject_distance - (shot.desired_dof / 2)
          far_limit  = scene2.subject_distance + (shot.desired_dof / 2)
          scene2.aperture = scene2.aperture_for_depth_of_field(near_limit, far_limit)

          #
          # adjust aperture
          #

          # ;;a = scene2.aperture
          # round aperture to closest 1/2 stop
          scene2.aperture = Aperture.new_from_v((scene2.aperture.to_v / 0.5).round * 0.5)
          # ;;puts "[1] #{a} => #{scene2.aperture}"
          # clamp to maximum aperture
          scene2.aperture = [scene2.aperture, lens.max_aperture].max
          # ;;puts "[2] #{a} => #{scene2.aperture}"

          #
          # calculate sensitivity
          #

          # start with minimum shutter time
          scene2.time = camera.max_shutter
          # round up to the next ISO value
          scene2.sensitivity = Sensitivity.new_from_v(scene2.sensitivity.to_v.ceil)
          scene2.sensitivity = [scene2.sensitivity, $max_sensitivity].min
          scene2.sensitivity = [scene2.sensitivity, $min_sensitivity].max
          # # force recalculation of shutter
          # scene2.time = nil

          #
          # compute subject distance difference
          #

          subject_distance_delta = scene.subject_distance - scene2.subject_distance

          #
          # compute angle of view difference
          #

          angle_of_view_delta = Angle.new(scene.angle_of_view - scene2.angle_of_view)

          #
          # validate
          #

          begin
            validate(scene2, camera, lens, subject_distance_delta, angle_of_view_delta)
          rescue => e
            failure = e
          end

          puts "  %-15.15s  |  %-19.19s  |  %10s @ %5s @ %8s  |  dist: %6s (%s%6s) |  dof: %6s (-%5s .. +%5s)  |  %s" % [
            camera.name,
            lens.name,
            scene2.aperture,
            scene2.time,
            scene2.sensitivity,
            scene2.subject_distance.to_s(:imperial),
            subject_distance_delta < 0 ? '-' : '+',
            subject_distance_delta.abs.to_s(:imperial),
            scene2.total_depth_of_field.to_s(:imperial),
            scene2.near_distance_from_subject.to_s(:imperial),
            scene2.far_distance_from_subject.to_s(:imperial),
            failure || 'GOOD'
          ] if options[:verbose] || !failure

          successes[camera.name] ||= {}

          if !failure
            successes[camera.name][lens.name] ||= 0
            successes[camera.name][lens.name] += 1
            found = true
            break
          end

        end

        break if found

      end

      unless found
        successes[camera.name]['FAILED'] ||= 0
        successes[camera.name]['FAILED'] += 1
      end

    end

  end

  ;;pp successes
  # ;;successes.sort_by { |k,v| v }.each { |k,v| puts "%2d: %s" % [v, k] }
end

#validate(scene, camera, lens, subject_distance_delta, angle_of_view_delta) ⇒ Object

FIXME: Ugh



89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
 
# File 'lib/photo_utils/tools/compare.rb', line 89

def validate(scene, camera, lens, subject_distance_delta, angle_of_view_delta)

  #
  # validate subject distance delta
  #

  if subject_distance_delta > $max_subject_distance_delta
    raise "subject distance delta too different (#{subject_distance_delta.to_s(:imperial)} > #{$max_subject_distance_delta.to_s(:imperial)})"
  end

  #
  # validate aperture
  #

  if scene.aperture > lens.min_aperture || scene.aperture < lens.max_aperture
    raise "aperture out of range (#{scene.aperture} != #{lens.max_aperture} .. #{lens.min_aperture})"
  end

  #
  # validate angle of view
  #

  if angle_of_view_delta > $max_angle_of_view_delta
    raise "angle of view too different (#{angle_of_view_delta} > #{$max_angle_of_view_delta})"
  end

  # if scene.angle_of_view - scene.angle_of_view > 5
  #   raise "angle of view too wide (#{scene2.angle_of_view} > #{scene.angle_of_view})"
  #   next
  # end

  #
  # validate shutter
  #

  if scene.time > camera.max_shutter
    raise "shutter too slow (#{scene.time} < #{camera.max_shutter})"
  end

end