Great to see a group!

i made a separate module for add my additional process.

<?php
// Hook into the convert PDF to images and save it in database.

function convert_nodeapi($node, $op){ //echo $node->type;die;
if( ($op == 'insert' || $op == 'update') && $node->type == 'magazine'){
// echo "

"; print_r($node->field_pdf[0]);echo "

";echo $node->nid;

$fid = $node->field_pdf[0]['fid'];          // Source file id
$uid = $node->field_pdf[0]['uid'];          // user id 
$nid = $node->nid;                      // node id
$cdir = "sites/default/files/nodes/".$nid."/";      // current directory

// Create node directory if it is not exists //
if(!is_dir("sites/default/files/nodes/".$nid))
{
    exec("mkdir sites/default/files/nodes/".$nid);
}

// Convert pdf to png file in its node specified like  sites/default/files/nodes/2/page.png // 
$w = 500;
$args = array(0 => '-thumbnail '.$w);
_imageapi_imagemagick_convert($node->field_pdf[0]['filepath'], "sites/default/files/nodes/".$nid ."/page.png", $args) ;

//exec("convert -density 400 ".$node->field_pdf[0]['filepath']. " -scale 1000x500 sites/default/files/nodes/".$nid ."/page.png");

// Read all converted files from newly created node directory //
db_query("DELETE from {mag.convert_pdf}  WHERE fid='".$fid."'");
if ($handle = opendir("sites/default/files/nodes/".$nid)) {
    while (false !== ($file = readdir($handle))) {
        if ($file != "." && $file != "..") {

        db_query("INSERT INTO {mag.convert_pdf}  (nid ,fid ,file_name ,cpath ,full_path ,updated)VALUES ( '".$nid."', '".$fid."', '".$file."', '".$cdir."', '".$cdir.$file."',CURRENT_TIMESTAMP);");

        }
    }
    closedir($handle);

}
}

}

There is no setting you have to place in imagemagick with drupal 6.17 (i am using ubuntu OS), Just install imagemagick and configure (if req.)
Enjoy.......... Cheers

Ajay singh rathore.