这篇文章主要介绍了php_imagick实现图片剪切、旋转、锐化、减色或增加特效的方法,可实现通过调用ImageMagick功能的PHP扩展使PHP具备和ImageMagick相同的功能,最终实现强大的ImageMagick图形处理功能,非常具有实用价值,需要的朋友可以参考下

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。