如何将pdf格式转换为jpg格式

Question

代码是写的，below.The输出附带了成功转换的图像，但没有建立在图像上。它已成功转换，但图像未在我定义的文件夹中正确生成。有什么建议吗？

<?php
$message = "";
$display = "";
if($_FILES)
{
    $output_dir = "uploads/";
    ini_set("display_errors",1);
    if(isset($_FILES["myfile"]))
    {
        $RandomNum   = time();

        $ImageName      = str_replace(' ','-',strtolower($_FILES['myfile']['name']));
        $ImageType      = $_FILES['myfile']['type']; //"image/png", image/jpeg etc.

        $ImageExt = substr($ImageName, strrpos($ImageName, '.'));
        $ImageExt       = str_replace('.','',$ImageExt);
        if($ImageExt != "pdf")
        {
            $message = "Invalid file format only <b>\"PDF\"</b> allowed.";
        }
        else
        {
            $ImageName      = preg_replace("/\.[^.\s]{3,4}$/", "", $ImageName);
            $NewImageName = $ImageName.'-'.$RandomNum.'.'.$ImageExt;

            move_uploaded_file($_FILES["myfile"]["tmp_name"],$output_dir. $NewImageName);

            $location   = "photos/";
            $name       = $output_dir. $NewImageName;
            $num = count_pages($name);
            $RandomNum   = time();
            $nameto     = $output_dir.$RandomNum.".jpg";
            $convert    = $location . " " . $name . " ".$nameto;
            exec($convert);
            for($i = 0; $i<$num;$i++)
            {
                $display .= "<img src='$output_dir$RandomNum-$i.jpg' title='Page-$i' /><br>"; 
            }
            $message = "PDF converted to JPEG sucessfully!!";
        }
    }
}
function count_pages($pdfname) {
      $pdftext = file_get_contents($pdfname);
      $num = preg_match_all("/\/Page\W/", $pdftext, $dummy);
      return $num;
    }
$content = $message.'<br />'.$display.'<br><form enctype="multipart/form-data" action="" method="post">
 Please choose a file: <input name="myfile" type="file" /><br />
 <input type="submit" value="Upload" />
 </form>';


echo $content;
?>

Answer 1

安装ghostscript

https://www.ghostscript.com/faq.html

在Linux apt上-get install ghostscript

在RedHat/Centos yum上安装ghostscript

安装ImageMagick

https://blog.runcloud.io/imagemagick/

在Linux apt上-get安装ImageMagick

在RedHat/Centos yum上安装ImageMagick

您需要安装perl，也可以使用PHP或其他语言自己进行几何计算。

转换脚本

此bash脚本将email_001.pdf转换为email_001.jpg

# convert possibly multi-part PDF to one or more jpegs
gs -sDEVICE=jpeg -dNOPAUSE -dBATCH -dSAFER -r600x600 -sOutputFile=email-%02d.jpg ./email_001.pdf
# get dimensions of the jpeg and then divide it by 4 or you get a huge combined jpg
GEOMETRY=`identify email-01.jpg | perl -ane '{@d=split "x", $F[3]; printf "%dx%d+0+0", $d[0]/4, $d[1]/4}'`
# join the jpegs together into a single jpeg
montage -tile 1 -density 200 -quality 100 -geometry $GEOMETRY ./email-*.jpg  ./email_001.jpg
# remove the intermediate jpegs
rm ./email-*.jpg

Answer 2

你可以使用ImageMagick来做更简单的事情。

从Imagick()类创建一个新对象

<?php
 // create Imagick object
 $imagick = new Imagick();

 // Reads image from PDF
 $imagick->readImage('myfile.pdf');

 // Writes an image or image sequence Example- converted-0.jpg, converted-1.jpg
 $imagick->writeImages('converted.jpg', false);
?> 

如果你有一个空输出的问题，下面是一些例子：(Origanl Post Here)

<?php
    $pdf = 'testfile.pdf';
    $save = 'output.jpg';

    exec('convert "'.$pdf.'" -colorspace RGB -resize 800 "'.$save.'"', $output, $return_var);
?>

如果所有这些都对您没有帮助，请使用。有关详细说明，请查看