37   var $_color;  variable in OutputDriverPNG
57     imagecolordeallocate($this->_image, $this->_color[0]);
58     array_shift($this->_color);
90     array_unshift($this->_color, array('rgb'    => $rgb,
118     return $this->_color[0]['object'];
122     imagecolordeallocate($this->_image, $this->_color[0]['object']);
123     $this->_color[0] = $color;
144     imageline($this->_image, $x1, $y1, $x2, $y2, $this->_color[0]['object']);
190     $this->_color    = array();
223     $this->_color[0] = array('rgb'    => array(0,0,0),
476     $this->_saveColor($this->_color[0]['rgb']);