<?PHP  /**  * 图片锐化处理  */  $red= imagecolorallocate($img, 255, 0, 0);  imageline($img, 0, 0, 100, 100, $red);  imageellipse($img, 200, 100, 100, 100, $red);  imagegif($img, "./images/map2.gif");  imagedestroy($img);  图片普通缩放  代码如下:  $filename="./images/hee.jpg";  $per=0.3;  list($width, $height)=getimagesize($filename);  $n_w=$width*$per;  $n_h=$width*$per;  $new=imagecreatetruecolor($n_w, $n_h);  $img=imagecreatefromjpeg($filename);  //拷贝部分图像并调整  imagecopyresized($new, $img,0, 0,0, 0,$n_w, $n_h, $width, $height);  //图像输出新图片、另存为  imagejpeg($new, "./images/hee2.jpg");  imagedestroy($new);  imagedestroy($img);  图片等比例缩放、没处理透明色  代码如下:  function thumn($background, $width, $height, $newfile) {  list($s_w, $s_h)=getimagesize($background);//获取原图片高度、宽度  if ($width && ($s_w < $s_h)) {  $width = ($height / $s_h) * $s_w;  } else {  $height = ($width / $s_w) * $s_h;  }  $new=imagecreatetruecolor($width, $height);  $img=imagecreatefromjpeg($background);  imagecopyresampled($new, $img, 0, 0, 0, 0, $width, $height, $s_w, $s_h);  imagejpeg($new, $newfile);  imagedestroy($new);  imagedestroy($img);  }  thumn("images/hee.jpg", 200, 200, "./images/hee3.jpg");  gif透明色处理  代码如下:  function thumn($background, $width, $height, $newfile) {  list($s_w, $s_h)=getimagesize($background);  if ($width && ($s_w < $s_h)) {  $width = ($height / $s_h) * $s_w;  } else {  $height = ($width / $s_w) * $s_h;  }  $new=imagecreatetruecolor($width, $height);  $img=imagecreatefromgif($background);  $otsc=imagecolortransparent($img);  if($otsc >=0 && $otst < imagecolorstotal($img)){//判断索引色  $tran=imagecolorsforindex($img, $otsc);//索引颜色值  $newt=imagecolorallocate($new, $tran["red"], $tran["green"], $tran["blue"]);  imagefill($new, 0, 0, $newt);  imagecolortransparent($new, $newt);  }  imagecopyresized($new, $img, 0, 0, 0, 0, $width, $height, $s_w, $s_h);  imagegif($new, $newfile);  imagedestroy($new);  imagedestroy($img);  }  thumn("images/map.gif", 200, 200, "./images/map3.gif");

<?php /** * 图片裁剪处理 * edit by www.1sucai.cn */ function cut($background, $cut_x, $cut_y, $cut_width, $cut_height, $location){ $back=imagecreatefromjpeg($background); $new=imagecreatetruecolor($cut_width, $cut_height); imagecopyresampled($new, $back, 0, 0, $cut_x, $cut_y, $cut_width, $cut_height,$cut_width,$cut_height); imagejpeg($new, $location); imagedestroy($new); imagedestroy($back); } cut("./images/hee.jpg", 440, 140, 117, 112, "./images/hee5.jpg"); ?>

<?PHP  /**  *  * 图片添加文字水印  */  function mark_text($background, $text, $x, $y){  $back=imagecreatefromjpeg($background);  $color=imagecolorallocate($back, 0, 255, 0);  imagettftext($back, 20, 0, $x, $y, $color, "simkai.ttf", $text);  imagejpeg($back, "./images/hee7.jpg");  imagedestroy($back);  }  mark_text("./images/hee.jpg", "细说PHP", 150, 250);  //图片水印  function mark_pic($background, $waterpic, $x, $y){  $back=imagecreatefromjpeg($background);  $water=imagecreatefromgif($waterpic);  $w_w=imagesx($water);  $w_h=imagesy($water);  imagecopy($back, $water, $x, $y, 0, 0, $w_w, $w_h);  imagejpeg($back,"./images/hee8.jpg");  imagedestroy($back);  imagedestroy($water);  }  mark_pic("./images/hee.jpg", "./images/gaolf.gif", 50, 200);

<?PHP  /**  * 图片旋转  */  $back=imagecreatefromjpeg("./images/hee.jpg");  $new=imagerotate($back, 45, 0);  imagejpeg($new, "./images/hee9.jpg");  ?>

<?php  /**  * 图片水平翻转 垂直翻转  */  function turn_y($background, $newfile){  $back=imagecreatefromjpeg($background);  $width=imagesx($back);  $height=imagesy($back);  $new=imagecreatetruecolor($width, $height);  for($x=0; $x < $width; $x++){  imagecopy($new, $back, $width-$x-1, 0, $x, 0, 1, $height);  }  imagejpeg($new, $newfile);  imagedestroy($back);  imagedestroy($new);  }  function turn_x($background, $newfile){  $back=imagecreatefromjpeg($background);  $width=imagesx($back);  $height=imagesy($back);  $new=imagecreatetruecolor($width, $height);  for($y=0; $y < $height; $y++){  imagecopy($new, $back,0, $height-$y-1, 0, $y, $width, 1);  }  imagejpeg($new, $newfile);  imagedestroy($back);  imagedestroy($new);  }  turn_y("./images/hee.jpg", "./images/hee11.jpg");  turn_x("./images/hee.jpg", "./images/hee12.jpg");  ?>