php图像操作类(1/3)

php教程图像操作类
本款程序可以获取图片大小，格式等信息，同时还可以对图片进行缩略图处理与给图片加水印功能哦。

class image{
        public $filename;
        private $info;
        private $im;


//构造
        public function __construct($filename){
                $this->filename = $filename;
                $this->info    = @getimagesize($filename);
    if($this->info[2]>3){echo "只支持gif、jpeg、png 格式。";exit;}

        }

// 载入
        public function imgload(){
   switch($this->info[2]){
    case 1:
    $this->im=@imagecreatefromgif($this->filename);
    break;
    case 2:
    $this->im=@imagecreatefromjpeg($this->filename);
    break;
    case 3:
    $this->im=@imagecreatefrompng($this->filename);
    break;
   }
        }

// 保存
        public function imagesave($img,$savename,$inf){
   switch($inf){
    case 1:
    imagegif($img,$savename);;
    break;
    case 2:
    imagejpeg($img,$savename);;
    break;
    case 3:
    imagepng($img,$savename);;
    break;
   }
        }


//滤镜
public function filter($arg=1,$savename=''){
  $this->imgload();

  if($savename=='')$savename='f_'.$this->filename;
     $ok=false;
     switch($arg){
   case 1:
   imagefilter($this->im,img_filter_negate);//反色
   $ok=true;
   break;
   case 2:
   imagefilter($this->im,img_filter_grayscale); //黑白
   $ok=true;
   break;
   case 3:
   imagefilter($this->im,img_filter_emboss);//浮雕
   $ok=true;
   break;
   case 4:
   imagefilter($this->im,img_filter_gaussian_blur); //高斯模糊
   $ok=true;
   break;
   case 5:
   imagefilter($this->im,img_filter_brightness,50); //亮度50
   $ok=true;
   break;
   case 6:
   imagefilter($this->im,img_filter_contrast,-50); //对比度-50
   $ok=true;
   break;
  }
  if($ok){
   $this->imagesave($this->im,$savename,$this->info[2]); //写文件
   imagedestroy($this->im);
   return 1;
  }else{
   imagedestroy($this->im);
   return 0;}
}

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补充：Php教程,图像处理