+ fprintf (stderr, " -I fade-in-step\n Specifies the opacity change between steps while fading in. (default 0.028)\n");
+ fprintf (stderr, " -O fade-out-step\n Specifies the opacity change between steps while fading out. (default 0.03)\n");
+ fprintf (stderr, " -D fade-delta-time\n Specifies the time between steps in a fade in milliseconds. (default 10)\n");