imagemagick - PHP Imagick produces black png from multi page pdf -

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i need uploaded pdf converted 1 long png image. simple images (e.g. jpg) works fine , pdf if convert last page (default). when try convert pages of pdf 1 png produces long black image or long black image white strip.

if ($file === null || !($file instanceof uploadedfile)) {         throw new \logicexception('no uploadable file found');     }     $tmpfile = $file->getrealpath();      try {         $im = new \imagick();         $im->pingimage($tmpfile);         $im->setresolution(140, 140);         $im->readimage($tmpfile);          switch ($file->getmimetype()) {                            case 'application/pdf':                 $im->resetiterator();                 $ima = $im->appendimages(true);                 $ima->setimageformat('png');                 $ima->writeimage();                 $ima->clear();                 $ima->destroy();                 break;             default:                 break; //return new response('error');         }

well figured out problem..may need this. dont know why , how pingimage() method caused problem. interesting imo not make problem if (by default) want convert 1 page of pdf or not multipaged images. removed method produced image correct. note use windows 8 , havent tried on linux. may method doesnt make problem on linux.


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