Watermark image script

Hi,
Thanks for looking and I appreciate any help you can offer, I have a small script that I place in a folder, this folder has lots of image files, the script adds a small watermark to the images in the folder when viewed. Everything is working fine with JPG files but it is not showing the watermark with PNG file formats? any ideas on what could be wrong?

[CODE]<?

*/

// IMAGE WATERMARK (comment line below if you do not want to use image watermark)
//Define(‘WATERMARK_IMAGE’, ‘./wt.png’); // path to watermark image
//Define(‘WATERMARK_PERCENT’, ’60’); // Intensity of the transition (in percent)

// TEXT WATERMARK (comment line below if you do not want to use text)
Define(‘WATERMARK_TEXT’, ‘my watermark’); // text to place (image will not be used)
Define(‘WATERMARK_TEXT_FONT’, ‘3’); // font 1 / 2 / 3 / 4 / 5
Define(‘TEXT_SHADOW’, ‘1’); // 1 – yes / 0 – no
Define(‘TEXT_COLOR’, ‘#FFFFFF’); // text color

// GENERAL SETTINGS
Define(‘WATERMARK_ALIGN_H’, ‘right’); // left / right / center
Define(‘WATERMARK_ALIGN_V’, ‘bottom’); // top / bottom / center
Define(‘WATERMARK_MARGIN’, ’10’); // margin

// —————————————————————————————-

$dr=preg_replace(‘/modify.php.+/’, ”, $_SERVER[‘PHP_SELF’]);
$filename=str_replace($dr, ‘./’, $_SERVER[‘PATH_INFO’]);

$lst=GetImageSize($filename);
$image_width=$lst[0];
$image_height=$lst[1];
$image_format=$lst[2];

if ($image_format==1) {
Header(“Content-Type:image/gif”);
readfile($filename);
exit;
} elseif ($image_format==2) {
$old_image=imagecreatefromjpeg($filename);
} elseif ($image_format==3) {
$old_image=imagecreatefrompng($filename);
} else {
readfile($filename);
exit;
}

if (Defined(‘WATERMARK_TEXT’) && WATERMARK_TEXT!=”) {
// text

$color = eregi_replace(“#”,””, TEXT_COLOR);
$red = hexdec(substr($color,0,2));
$green = hexdec(substr($color,2,2));
$blue = hexdec(substr($color,4,2));

$text_color = imagecolorallocate ($old_image, $red, $green, $blue);

$text_height=imagefontheight(WATERMARK_TEXT_FONT);
$text_width=strlen(WATERMARK_TEXT)*imagefontwidth(WATERMARK_TEXT_FONT);
$wt_y=WATERMARK_MARGIN;
if (WATERMARK_ALIGN_V==’top’) {
$wt_y=WATERMARK_MARGIN;
} elseif (WATERMARK_ALIGN_V==’bottom’) {
$wt_y=$image_height-$text_height-WATERMARK_MARGIN;
} elseif (WATERMARK_ALIGN_V==’center’) {
$wt_y=(int)($image_height/2-$text_height/2);
}

$wt_x=WATERMARK_MARGIN;
if (WATERMARK_ALIGN_H==’left’) {
$wt_x=WATERMARK_MARGIN;
} elseif (WATERMARK_ALIGN_H==’right’) {
$wt_x=$image_width-$text_width-WATERMARK_MARGIN;
} elseif (WATERMARK_ALIGN_H==’center’) {
$wt_x=(int)($image_width/2-$text_width/2);
}

if (TEXT_SHADOW==’1′) {
imagestring($old_image, WATERMARK_TEXT_FONT, $wt_x+1, $wt_y+1, WATERMARK_TEXT, 0);
}
imagestring($old_image, WATERMARK_TEXT_FONT, $wt_x, $wt_y, WATERMARK_TEXT, $text_color);

}

if (Defined(‘WATERMARK_IMAGE’) && WATERMARK_IMAGE!=” && file_exists(WATERMARK_IMAGE)) {
// image

$lst2=GetImageSize(WATERMARK_IMAGE);
$image2_width=$lst2[0];
$image2_height=$lst2[1];
$image2_format=$lst2[2];

if ($image2_format==2) {
$wt_image=imagecreatefromjpeg(WATERMARK_IMAGE);
} elseif ($image2_format==3) {
$wt_image=imagecreatefrompng(WATERMARK_IMAGE);
}

if ($wt_image) {

$wt_y=WATERMARK_MARGIN;
if (WATERMARK_ALIGN_V==’top’) {
$wt_y=WATERMARK_MARGIN;
} elseif (WATERMARK_ALIGN_V==’bottom’) {
$wt_y=$image_height-$image2_height-WATERMARK_MARGIN;
} elseif (WATERMARK_ALIGN_V==’center’) {
$wt_y=(int)($image_height/2-$image2_height/2);
}

$wt_x=WATERMARK_MARGIN;
if (WATERMARK_ALIGN_H==’left’) {
$wt_x=WATERMARK_MARGIN;
} elseif (WATERMARK_ALIGN_H==’right’) {
$wt_x=$image_width-$image2_width-WATERMARK_MARGIN;
} elseif (WATERMARK_ALIGN_H==’center’) {
$wt_x=(int)($image_width/2-$image2_width/2);
}

imagecopymerge($old_image, $wt_image, $wt_x, $wt_y, 0, 0, $image2_width, $image2_height, WATERMARK_PERCENT);
}

}

if ($image_format==2) {
imageJpeg($old_image);
}
if ($image_format==3) {
imagePng($old_image);
}

?>[/CODE]

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