shoesCodeFor · August 29, 2018 20:23 · Apr 25, 2011 · Apr 18, 2011 · Apr 18, 2011 · Apr 18, 2011
diff --git a/delta_e_diff.rb b/delta_e_diff.rb
@@ -14,17 +14,20 @@
 images.first.height.times do |y|
   images.first.row(y).each_with_index do |pixel, x|
     unless pixel == images.last[x,y]
-      diff << [x,y]
-
       score = Math.sqrt(
         (r(images.last[x,y]) - r(pixel)) ** 2 +
         (g(images.last[x,y]) - g(pixel)) ** 2 +
         (b(images.last[x,y]) - b(pixel)) ** 2
-      )
+      ) / Math.sqrt(MAX ** 2 * 3)
 
-      output[x,y] = grayscale(MAX - ((score / Math.sqrt(MAX ** 2 * 3)) * 255).round)
+      output[x,y] = grayscale(MAX - (score * 255).round)
+      diff << score
     end
   end
 end
 
+puts "pixels (total):     #{images.first.pixels.length}"
+puts "pixels changed:     #{diff.length}"
+puts "image changed (%): #{(diff.inject {|sum, value| sum + value} / images.first.pixels.length) * 100}%"
+
 output.save('diff.png')
diff --git a/delta_e_diff.rb b/delta_e_diff.rb
@@ -28,4 +28,3 @@
 end
 
 output.save('diff.png')
-
diff --git a/1.png b/1.png
diff --git a/2.png b/2.png
diff --git a/delta_e_diff.rb b/delta_e_diff.rb
@@ -0,0 +1,31 @@
+require 'chunky_png'
+include ChunkyPNG::Color
+
+
+images = [
+  ChunkyPNG::Image.from_file('1.png'),
+  ChunkyPNG::Image.from_file('2.png')
+]
+
+output = ChunkyPNG::Image.new(images.first.width, images.last.width, WHITE)
+
+diff = []
+
+images.first.height.times do |y|
+  images.first.row(y).each_with_index do |pixel, x|
+    unless pixel == images.last[x,y]
+      diff << [x,y]
+
+      score = Math.sqrt(
+        (r(images.last[x,y]) - r(pixel)) ** 2 +
+        (g(images.last[x,y]) - g(pixel)) ** 2 +
+        (b(images.last[x,y]) - b(pixel)) ** 2
+      )
+
+      output[x,y] = grayscale(MAX - ((score / Math.sqrt(MAX ** 2 * 3)) * 255).round)
+    end
+  end
+end
+
+output.save('diff.png')
+
diff --git a/diff.png b/diff.png
diff --git a/delta_e_diff.rb b/delta_e_diff.rb
@@ -0,0 +1,30 @@
+require 'chunky_png'
+include ChunkyPNG::Color
+
+
+images = [
+  ChunkyPNG::Image.from_file('1.png'),
+  ChunkyPNG::Image.from_file('2.png')
+]
+
+output = ChunkyPNG::Image.new(images.first.width, images.last.width, WHITE)
+
+diff = []
+
+images.first.height.times do |y|
+  images.first.row(y).each_with_index do |pixel, x|
+    unless pixel == images.last[x,y]
+      diff << [x,y]
+
+      score = Math.sqrt(
+        (r(images.last[x,y]) - r(pixel)) ** 2 +
+        (g(images.last[x,y]) - g(pixel)) ** 2 +
+        (b(images.last[x,y]) - b(pixel)) ** 2
+      )
+
+      output[x,y] = grayscale(MAX - ((score / Math.sqrt(MAX ** 2 * 3)) * 255).round)
+    end
+  end
+end
+
+output.save('diff.png')
No results found