php_imagick实现图片剪切、旋转、锐化、减色或增加特效的方法


Posted in PHP onDecember 15, 2014

本文实例讲述了php_imagick实现图片剪切、旋转、锐化、减色或增加特效的方法。分享给大家供大家参考。具体分析如下:

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

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

<?php  

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
<?php  

$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
<?php  

/* 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,

示例:

裁切/生成缩略图/添加水印, 自动检测和处理 GIF

调用方式:

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
<?php  

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  

}

希望本文所述对大家的PHP程序设计有所帮助。

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