README.rdoc in chunky_png-1.0.0.beta2 vs README.rdoc in chunky_png-1.0.0.rc1

@@ -33,16 +33,16 @@
   require 'chunky_png'
 
   # Creating an image from scratch, save as an interlaced PNG
   png = ChunkyPNG::Image.new(16, 16, ChunkyPNG::Color::TRANSPARENT)
   png[1,1] = ChunkyPNG::Color.rgba(10, 20, 30, 128)
-  png[2,1] = ChunkyPNG::Color.rgba(0, 0, 0, 128)
+  png[2,1] = ChunkyPNG::Color('black @ 0.5')
   png.save('filename.png', :interlace => true)
 
   # Compose images using alpha blending.
   avatar = ChunkyPNG::Image.from_file('avatar.png')
   badge  = ChunkyPNG::Image.from_file('no_ie_badge.png')
-  avatar.compose(badge, 10, 10)
+  avatar.compose!(badge, 10, 10)
   avatar.save('composited.png', :fast_rgba) # Force the fast saving routine.
   
   # Accessing metadata
   image = ChunkyPNG::Image.from_file('with_metadata.png')
   puts image.metadata['Title']