lib/chunky_png/palette.rb in chunky_png-0.5.8 vs lib/chunky_png/palette.rb in chunky_png-0.6.0

@@ -87,9 +87,16 @@
     # @return [true, false] True if all colors in this palette are grayscale teints.
     # @see ChunkyPNG::Color#grayscale??
     def grayscale?
       all? { |color| Color.grayscale?(color) }
     end
+    
+    # Returns a palette with all the opaque variants of the colors in this palette.
+    # @return [ChunkyPNG::Palette] A new Palette instance with only opaque colors.
+    # @see ChunkyPNG::Color#opaque!
+    def opaque_palette
+      self.class.new(map { |c| ChunkyPNG::Color.opaque!(c) })
+    end
 
     # Checks whether this palette is suitable for decoding an image from a datastream.
     #
     # This requires that the positions of the colors in the original palette chunk is known,
     # which is stored as an array in the +@decoding_map+ instance variable.