php_imagick实现图片剪切、旋转、锐化、减色或增加特效

一个可以供PHP调用ImageMagick功能的PHP扩展。使用这个扩展可以使PHP具备和ImageMagick相同的功能。

ImageMagick是一套功能强大、稳定而且免费的工具集和开发包，可以用来读、写和处理超过185种基本格式的图片文件，包括流行的TIFF, JPEG, GIF, PNG, PDF以及PhotoCD等格式。利用ImageMagick，你可以根据web应用程序的需要动态生成图片, 还可以对一个（或一组）图片进行改变大小、旋转、锐化、减色或增加特效等操作，并将操作的结果以相同格式或其它格式保存。

php_imagick是PHP对图片处理的一个扩展包，可以完成对图片改变大小、旋转、锐化、减色或增加特效等操作。
一、windows下安装Imagick扩展：

1、下载 ImageMagick并安装

http://image_magick.veidrodis.com/image_magick/binaries/ImageMagick-6.6.2-10-Q16-windows-dll.exe

2、下载php_imagick.dll

http://valokuva.org/outside-blog-content/imagick-windows-builds/php53/imagick-2.3.0-dev/vc9_nts/php_imagick.dll

如果你用的是线程安全的php，请下载
http://valokuva.org/outside-blog-content/imagick- windows-builds/php53/imagick-2.3.0-dev/vc9_zts/php_imagick.dll

3、设置
在php.ini中添加
extension=php_imagick.dll ，重启web server

二、linux下安装Imagick扩展：

1.yum安装ImageMagick

yum install ImageMagick ImageMagick-devel

2.测试是否安装成功

convert -version

3.安装imagick扩展

 

01.wget http://pecl.php.net/get/imagick-3.1.0RC2.tgz02.tar xzvf imagick-3.1.0RC2.tgz03.cd imagick-3.1.0RC204.phpize05../configure06.make07.make install

4.编辑php.ini文件，在文件末尾添加如下代码

extension=imagick.so

5. 重新启动apache服务器

service httpd restart

三、案例
1. 边框处理

 

代码如下	复制代码
//by www.bKjia.c0m header('Content-type: image/jpeg'); $image = new Imagick('test.jpg'); $color=new ImagickPixel(); $color->setColor("rgb(220,220,220)"); $image->borderImage($color,5,4); $image->blurImage(5,5,imagick::CHANNEL_GREEN); echo $image;

我们先来看个简单的实例

php_imagick程序示例

1.创建一个缩略图并显示出来

代码如下	复制代码
header('Content-type: image/jpeg'); $image = new Imagick('image.jpg'); // If 0 is provided as a width or height parameter,// aspect ratio is maintained $image->thumbnailImage(100, 0); echo $image; ?>

2.创建一个目录下的缩略图，并保存

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

3.缩略GIF动画图片

代码如下	复制代码
/* 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); ?>

现在我们进入正题吧，

例1

裁切/生成缩略图/添加水印, 自动检测和处理 GIF

调用方式:

代码如下	复制代码
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');

imagick.class.php 

代码如下

复制代码

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($width           if($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 }