Experimental shader active.
    Jcrop now includes a shading mode that facilitates building
    better transparent Jcrop instances. The experimental shader is less
    robust than Jcrop's default shading method and should only be
    used if you require this functionality. 
  
  
    Animation/Transitions.
    Demonstration of animateTo API method and transitions for bgColor
    and bgOpacity options. Color fading requires inclusion of John Resig's
    jQuery Color 
    Animations plugin. If it is not included, colors will not fade.