background of watermark is black on zubrag watermark Script - php

Question

i am applying watermark onto the image using this code why the background of the watermark image is black after applying watermark even the watermark is in png format and it is transparent this is the script zubrag
$image_path = $filename;
// Where to save watermarked image
$imgdestpath = $destination_folder . basename($filename);
// Watermark image
$img = new Zubrag_watermark($image_path);
$img->ApplyWatermark($watermark_path);
$img->SaveAsFile($imgdestpath);
$img->Free();
function ApplyWatermark($watermark_path) {
$this->watermark_path = $watermark_path;
// Determine image size and type
$size = getimagesize($this->image_path);
$size_x = $size[0];
$size_y = $size[1];
$image_type = $size[2]; // 1 = GIF, 2 = JPG, 3 = PNG
// load source image
$image = $this->ImageCreateFromType($image_type, $this->image_path);
// Determine watermark size and type
$wsize = getimagesize($watermark_path);
$watermark_x = $wsize[0];
$watermark_y = $wsize[1];
$watermark_type = $wsize[2]; // 1 = GIF, 2 = JPG, 3 = PNG
// load watermark
$watermark = $this->ImageCreateFromType($watermark_type, $watermark_path);
// where do we put watermark on the image?
$dest_x = $size_x - $watermark_x - $this->offset_x;
$dest_y = $size_y - $watermark_y - $this->offset_y;
imagecopymerge($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_x, $watermark_y, 100);
$this->image = &$image;
$this->watermark = &$watermark;
$this->image_type = $image_type;
}

Answer 1

Try this - change
imagecopymerge($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_x, $watermark_y, 100);
to use a slightly different function, and remove the final variable:
imagecopy($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_x, $watermark_y);