php_imagick实现图片剪切、旋转、锐化、减色或增加_php教程

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

//by www.vcphp.com

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，

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:

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

}

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