PDF to PNG Transparency Problem

[rananaskar]

I have a pdf which have a transparent background and it also contains a white image, but the problem is when i am removing the background it's removing the white text also.

Here is the code i am using

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$imagename=time().'.png';
$userfile_tmp = $_FILES['image']['tmp_name'];
$im = new Imagick($userfile_tmp);
// $im->flattenImages();
$im->setImageFormat('png');

// $im->paintTransparentImage('white', 0, 10000);

$im->paintTransparentImage($im->getImageBackgroundColor(), 0, 10000);

$im->setImageColorspace(imagick::COLORSPACE_CMYK);

$im->writeImage('pdftopng/'.$imagename);

$run = exec("convert pdftopng/".$imagename." -fill none -draw 'matte 0,0 floodfill' -shave 1x1 pdftopng/".$imagename);

I also tried adding

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-transparent white

but the problem is still remaining.