Data commit

Task/Grayscale-image/Crystal/grayscale-image.crystal

@@ -0,0 +1,18 @@
+class RGBColour
+  def to_grayscale
+    luminosity = (0.2126*@red + 0.7152*@green + 0.0722*@blue).to_i
+    self.class.new(luminosity, luminosity, luminosity)
+  end
+end
+
+class Pixmap
+  def to_grayscale
+    gray = self.class.new(@width, @height)
+    @width.times do |x|
+      @height.times do |y|
+        gray[x,y] = self[x,y].to_grayscale
+      end
+    end
+    gray
+  end
+end