php_imagick实现图片剪切、旋转、锐化、减色或增加特效

$images = new Imagick(glob('images/*.JPG'));
foreach($images as $image) {
// Providing 0 forces thumbnailImage to maintain aspect ratio
$image->thumbnailImage(1024,0);
}
$images->writeImages();
?>

/* Create a new imagick object and read in GIF */
$im = new Imagick("example.gif");
/* Resize all frames */
foreach ($im as $frame) {
/* 50x50 frames */
$frame->thumbnailImage(50, 50);
/* Set the virtual canvas to correct size */
$frame->setImagePage(50, 50, 0, 0);
}/* Notice writeImages instead of writeImage */
$im->writeImages("example_small.gif", true);
?>

include 'imagick.class.php';

$image = new lib_image_imagick();

$image->open('a.gif');
$image->resize_to(100, 100, 'scale_fill');
$image->add_text('1024i.com', 10, 20);
$image->add_watermark('1024i.gif', 10, 50);
$image->save_to('x.gif');

class lib_image_imagick
{
 private $image = null;
 private $type = null;

 // 构造函数
 public function __construct(){}

 // 析构函数
 public function __destruct()
 {
     if($this->image!==null) $this->image->destroy();
 }

 // 载入图像
 public function open($path)
 {
  $this->image = new Imagick( $path );
  if($this->image)
  {
      $this->type = strtolower($this->image->getImageFormat());
  }
  return $this->image;
 }
 

 public function crop($x=0, $y=0, $width=null, $height=null)
 {
     if($width==null) $width = $this->image->getImageWidth()-$x;
     if($height==null) $height = $this->image->getImageHeight()-$y;
     if($width<=0 || $height<=0) return;
    
     if($this->type=='gif')
     {
            $image = $this->image;
         $canvas = new Imagick();
        
         $images = $image->coalesceImages();
         foreach($images as $frame){
             $img = new Imagick();
             $img->readImageBlob($frame);
                $img->cropImage($width, $height, $x, $y);

                $canvas->addImage( $img );
                $canvas->setImageDelay( $img->getImageDelay() );
                $canvas->setImagePage($width, $height, 0, 0);
            }
           
            $image->destroy();
         $this->image = $canvas;
     }
     else
     {
         $this->image->cropImage($width, $height, $x, $y);
     }
 }

 /*
 * 更改图像大小
 $fit: 适应大小方式
 'force': 把图片强制变形成 $width X $height 大小
 'scale': 按比例在安全框 $width X $height 内缩放图片, 输出缩放后图像大小 不完全等于 $width X $height
 'scale_fill': 按比例在安全框 $width X $height 内缩放图片，安全框内没有像素的地方填充色, 使用此参数时可设置背景填充色 $bg_color = array(255,255,255)(红,绿,蓝, 透明度) 透明度(0不透明-127完全透明))
 其它: 智能模能 缩放图像并载取图像的中间部分 $width X $height 像素大小
 $fit = 'force','scale','scale_fill' 时： 输出完整图像
 $fit = 图像方位值 时, 输出指定位置部分图像
 字母与图像的对应关系如下:
 
 north_west   north   north_east
 
 west         center        east
 
 south_west   south   south_east
 
 */
 public function resize_to($width = 100, $height = 100, $fit = 'center', $fill_color = array(255,255,255,0) )
 {
    
     switch($fit)
     {
         case 'force':
             if($this->type=='gif')
             {
                 $image = $this->image;
                 $canvas = new Imagick();
                
                 $images = $image->coalesceImages();
                 foreach($images as $frame){
                     $img = new Imagick();
                     $img->readImageBlob($frame);
                        $img->thumbnailImage( $width, $height, false );

                        $canvas->addImage( $img );
                        $canvas->setImageDelay( $img->getImageDelay() );
                    }
                    $image->destroy();
                 $this->image = $canvas;
             }
             else
             {
                 $this->image->thumbnailImage( $width, $height, false );
             }
             break;
         case 'scale':
             if($this->type=='gif')
             {
                 $image = $this->image;
                 $images = $image->coalesceImages();
                 $canvas = new Imagick();
                 foreach($images as $frame){
                     $img = new Imagick();
                     $img->readImageBlob($frame);
                        $img->thumbnailImage( $width, $height, true );

                        $canvas->addImage( $img );
                        $canvas->setImageDelay( $img->getImageDelay() );
                    }
                    $image->destroy();
                 $this->image = $canvas;
             }
             else
             {
                 $this->image->thumbnailImage( $width, $height, true );
             }
             break;
         case 'scale_fill':
             $size = $this->image->getImagePage();
             $src_width = $size['width'];
             $src_height = $size['height'];
            
                $x = 0;
                $y = 0;
               
                $dst_width = $width;
                $dst_height = $height;

       if($src_width*$height > $src_height*$width)
    {
     $dst_height = intval($width*$src_height/$src_width);
     $y = intval( ($height-$dst_height)/2 );
    }
    else
    {
     $dst_width = intval($height*$src_width/$src_height);
     $x = intval( ($width-$dst_width)/2 );
    }

                $image = $this->image;
                $canvas = new Imagick();
               
                $color = 'rgba('.$fill_color[0].','.$fill_color[1].','.$fill_color[2].','.$fill_color[3].')';
             if($this->type=='gif')
             {
                 $images = $image->coalesceImages();
                 foreach($images as $frame)
                 {
                     $frame->thumbnailImage( $width, $height, true );

                     $draw = new ImagickDraw();
                        $draw->composite($frame->getImageCompose(), $x, $y, $dst_width, $dst_height, $frame);

                        $img = new Imagick();
                        $img->newImage($width, $height, $color, 'gif');
                        $img->drawImage($draw);

                        $canvas->addImage( $img );
                        $canvas->setImageDelay( $img->getImageDelay() );
                        $canvas->setImagePage($width, $height, 0, 0);
                    }
             }
             else
             {
                 $image->thumbnailImage( $width, $height, true );
                
                 $draw = new ImagickDraw();
                    $draw->composite($image->getImageCompose(), $x, $y, $dst_width, $dst_height, $image);
                   
                 $canvas->newImage($width, $height, $color, $this->get_type() );
                    $canvas->drawImage($draw);
                    $canvas->setImagePage($width, $height, 0, 0);
             }
             $image->destroy();
             $this->image = $canvas;
             break;
   default:
    $size = $this->image->getImagePage();
       $src_width = $size['width'];
             $src_height = $size['height'];
            
                $crop_x = 0;
                $crop_y = 0;
               
                $crop_w = $src_width;
                $crop_h = $src_height;
               
          if($src_width*$height > $src_height*$width)
    {
     $crop_w = intval($src_height*$width/$height);
    }
    else
    {
        $crop_h = intval($src_width*$height/$width);
    }
               
       switch($fit)
             {
        case 'north_west':
            $crop_x = 0;
            $crop_y = 0;
            break;
           case 'north':
               $crop_x = intval( ($src_width-$crop_w)/2 );
               $crop_y = 0;
               break;
           case 'north_east':
               $crop_x = $src_width-$crop_w;
               $crop_y = 0;
               break;
           case 'west':
               $crop_x = 0;
               $crop_y = intval( ($src_height-$crop_h)/2 );
               break;
           case 'center':
               $crop_x = intval( ($src_width-$crop_w)/2 );
               $crop_y = intval( ($src_height-$crop_h)/2 );
               break;
           case 'east':
               $crop_x = $src_width-$crop_w;
               $crop_y = intval( ($src_height-$crop_h)/2 );
               break;
           case 'south_west':
               $crop_x = 0;
               $crop_y = $src_height-$crop_h;
               break;
           case 'south':
               $crop_x = intval( ($src_width-$crop_w)/2 );
               $crop_y = $src_height-$crop_h;
               break;
           case 'south_east':
               $crop_x = $src_width-$crop_w;
               $crop_y = $src_height-$crop_h;
               break;
           default:
               $crop_x = intval( ($src_width-$crop_w)/2 );
               $crop_y = intval( ($src_height-$crop_h)/2 );
             }
            
             $image = $this->image;
             $canvas = new Imagick();
            
          if($this->type=='gif')
             {
                 $images = $image->coalesceImages();
                 foreach($images as $frame){
                     $img = new Imagick();
                     $img->readImageBlob($frame);
                        $img->cropImage($crop_w, $crop_h, $crop_x, $crop_y);
                        $img->thumbnailImage( $width, $height, true );
                       
                        $canvas->addImage( $img );
                        $canvas->setImageDelay( $img->getImageDelay() );
                        $canvas->setImagePage($width, $height, 0, 0);
                    }
             }
             else
             {
                 $image->cropImage($crop_w, $crop_h, $crop_x, $crop_y);
                 $image->thumbnailImage( $width, $height, true );
                 $canvas->addImage( $image );
                 $canvas->setImagePage($width, $height, 0, 0);
             }
             $image->destroy();
             $this->image = $canvas;
     }
    
 }
 

 // 添加水印图片
 public function add_watermark($path, $x = 0, $y = 0)
 {
        $watermark = new Imagick($path);
        $draw = new ImagickDraw();
        $draw->composite($watermark->getImageCompose(), $x, $y, $watermark->getImageWidth(), $watermark->getimageheight(), $watermark);

     if($this->type=='gif')
     {
         $image = $this->image;
            $canvas = new Imagick();
         $images = $image->coalesceImages();
         foreach($image as $frame)
         {
                $img = new Imagick();
             $img->readImageBlob($frame);
                $img->drawImage($draw);
               
                $canvas->addImage( $img );
                $canvas->setImageDelay( $img->getImageDelay() );
            }
            $image->destroy();
         $this->image = $canvas;
     }
     else
     {
         $this->image->drawImage($draw);
     }
 }

 
 // 添加水印文字
 public function add_text($text, $x = 0 , $y = 0, $angle=0, $style=array())
 {
        $draw = new ImagickDraw();
        if(isset($style['font'])) $draw->setFont($style['font']);
        if(isset($style['font_size'])) $draw->setFontSize($style['font_size']);
     if(isset($style['fill_color'])) $draw->setFillColor($style['fill_color']);
     if(isset($style['under_color'])) $draw->setTextUnderColor($style['under_color']);
    
     if($this->type=='gif')
     {
         foreach($this->image as $frame)
         {
             $frame->annotateImage($draw, $x, $y, $angle, $text);
         }
     }
     else
     {
         $this->image->annotateImage($draw, $x, $y, $angle, $text);
     }
 }
 
 
 // 保存到指定路径
 public function save_to( $path )
 {
     if($this->type=='gif')
     {
         $this->image->writeImages($path, true);
     }
     else
     {
         $this->image->writeImage($path);
     }
 }

 // 输出图像
 public function output($header = true)
 {
     if($header) header('Content-type: '.$this->type);
     echo $this->image->getImagesBlob();  
 }

 
 public function get_width()
 {
        $size = $this->image->getImagePage();
        return $size['width'];
 }
 
 public function get_height()
 {
     $size = $this->image->getImagePage();
        return $size['height'];
 }

 // 设置图像类型， 默认与源类型一致
 public function set_type( $type='png' )
 {
     $this->type = $type;
        $this->image->setImageFormat( $type );
 }

 // 获取源图像类型
 public function get_type()
 {
  return $this->type;
 }

 // 当前对象是否为图片
 public function is_image()
 {
  if( $this->image )
   return true;
  else
   return false;
 }
 

 public function thumbnail($width = 100, $height = 100, $fit = true){ $this->image->thumbnailImage( $width, $height, $fit );} // 生成缩略图 $fit为真时将保持比例并在安全框 $width X $height 内生成缩略图片

 /*
 添加一个边框
 $width: 左右边框宽度
 $height: 上下边框宽度
 $color: 颜色: RGB 颜色 'rgb(255,0,0)' 或 16进制颜色 '#FF0000' 或颜色单词 'white'/'red'...
 */
 public function border($width, $height, $color='rgb(220, 220, 220)')
 {
  $color=new ImagickPixel();
  $color->setColor($color);
  $this->image->borderImage($color, $width, $height);
 }
 
 public function blur($radius, $sigma){$this->image->blurImage($radius, $sigma);} // 模糊
 public function gaussian_blur($radius, $sigma){$this->image->gaussianBlurImage($radius, $sigma);} // 高斯模糊
 public function motion_blur($radius, $sigma, $angle){$this->image->motionBlurImage($radius, $sigma, $angle);} // 运动模糊
 public function radial_blur($radius){$this->image->radialBlurImage($radius);} // 径向模糊

 public function add_noise($type=null){$this->image->addNoiseImage($type==null?imagick::NOISE_IMPULSE:$type);} // 添加噪点
 
 public function level($black_point, $gamma, $white_point){$this->image->levelImage($black_point, $gamma, $white_point);} // 调整色阶
 public function modulate($brightness, $saturation, $hue){$this->image->modulateImage($brightness, $saturation, $hue);} // 调整亮度、饱和度、色调

 public function charcoal($radius, $sigma){$this->image->charcoalImage($radius, $sigma);} // 素描
 public function oil_paint($radius){$this->image->oilPaintImage($radius);} // 油画效果
 
 public function flop(){$this->image->flopImage();} // 水平翻转
 public function flip(){$this->image->flipImage();} // 垂直翻转

}