Home Backend Development PHP Tutorial PHP使用imagick读取PDF生成png缩略图的两种方法_php实例

PHP使用imagick读取PDF生成png缩略图的两种方法_php实例

May 17, 2016 am 08:47 AM
imagick pdf php png

一、ImageMagick是什么
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。
二、php_imagick什么
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。
三、PDF生成png缩略图的两种方法
第一种:
复制代码 代码如下:
/**
* PDF2PNG  
* @param $pdf  待处理的PDF文件
* @param $path 待保存的图片路径
* @param $page 待导出的页面 -1为全部 0为第一页 1为第二页
* @return      保存好的图片路径和文件名
*/
 function pdf2png($pdf,$path,$page=0)

   if(!is_dir($path))
   {
       mkdir($path,true);
   }
   if(!extension_loaded('imagick'))
   { 
     echo '没有找到imagick!' ;
     return false;
   } 
   if(!file_exists($pdf))
   { 
      echo '没有找到pdf' ;
       return false; 
   } 
   $im = new Imagick(); 
   $im->setResolution(120,120);   //设置图像分辨率
   $im->setCompressionQuality(80); //压缩比
   $im->readImage($pdf."[".$page."]"); //设置读取pdf的第一页
   //$im->thumbnailImage(200, 100, true); // 改变图像的大小
   $im->scaleImage(200,100,true); //缩放大小图像
   $filename = $path."/". time().'.png';
   if($im->writeImage($filename) == true)
   { 
      $Return  = $filename; 
   } 
   return $Return; 

$s = pdf2png('file/1371273225-ceshi_ppt.pdf','images');
echo '
PHP使用imagick读取PDF生成png缩略图的两种方法_php实例
';

第二种:
复制代码 代码如下:
function pdf2png($PDF,$Path){
   if(!extension_loaded('imagick')){
     return false;
   }
   if(!file_exists($PDF)){
     return false;
   }
   $IM = new imagick();
   $IM->setResolution(120,120);
   $IM->setCompressionQuality(100);
   $IM->readImage($PDF);
   foreach ($IM as $Key => $Var){
     $Var->setImageFormat('png');
     $Filename = $Path.'/'.md5($Key.time()).'.png';
     if($Var->writeImage($Filename) == true){
       $Return[] = $Filename;
     }
   }
   return $Return;
}
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