2 letter icon image creation

<?php

    class Image {

        function __construct() {

            $this->fontSize = mt_rand(12, 48);
            $this->rotationDegree = mt_rand(0, 360);
            $this->font = 'http://ireader.googlecode.com/files/arial.ttf';
        }

        public function set($var, $val) {

            $this->$var = $val;
        }

        public function backgroundImage($src) {

            $this->source = imagecreatefrompng($src);
            $this->width = imagesx($this->source);
            $this->height = imagesy($this->source);
        }

        public function color($hex) {

            if ($hex[0] == '#') {

                $hex = substr($hex, 1);
            }

            if (strlen($hex) == 6) {

                list($r, $g, $b) = array($hex[0].$hex[1],
                                         $hex[2].$hex[3],
                                         $hex[4].$hex[5]);

            }
            else if (strlen($color) == 3) {

                list($r, $g, $b) = array($hex[0].$hex[0], $hex[1].$hex[1], $hex[2].$hex[2]);
            }
            else {

                return false;
            }

            $this->fontColor['r'] = hexdec($r);
            $this->fontColor['g'] = hexdec($g);
            $this->fontColor['b'] = hexdec($b);
        }

        public function text($text, $maxLength = false) {

            $this->text = ucfirst(strtolower(($maxLength !== false ? (strlen($text) <= $maxLength ? $text : substr($text, 0, $maxLength)) : $text)));
        }

        public function output() {

            $newImage = imagecreatetruecolor($this->width, $this->height);
            imagealphablending($newImage, false);
            imagesavealpha($newImage, true);
            $transparent = imagecolorallocatealpha($newImage, 255, 255, 255, 127);
            imagefilledrectangle($newImage, 0, 0, $this->width, $this->height, $transparent);
            imagecopyresampled($newImage, $this->source, 0, 0, 0, 0, $this->width, $this->height, $this->width, $this->height);
            imagealphablending($newImage, true);

            $xbox = imagettfbbox($this->fontSize, $this->rotationDegree, $this->font, $this->text);
            $x = ($this->width / 2) - (((($xbox[2] - $xbox[0]) + ($xbox[4] - $xbox[6])) / 2) / 2);

            $ybox = imagettfbbox($this->fontSize, $this->rotationDegree, $this->font, substr($this->text, 0, 1));
            $y = ($this->height / 2) - (((($ybox[3] - $ybox[5]) + ($ybox[1] - $ybox[7])) / 2) / 2) + ($ybox[3] - $ybox[5]);

            $color = imagecolorallocate($newImage, $this->fontColor['r'], $this->fontColor['g'], $this->fontColor['b']);

            imagettftext($newImage, $this->fontSize, $this->rotationDegree, $x, $y, $color, $this->font, $this->text);

            imagepng($newImage);

            imagedestroy($newImage);
        }
    }

?>