code: function(callback) {
  		this.history.push('create image');
  		var buff = new Buffer(this.width * this.height * 4);
  		buff.fill(0);
  		this.data = buff;
  		callback.call(this);
  	}
docs: create(function callback)
  
  Create a new palette from sizes of canvas.
  @param callback - call function after creating a palette.