can anyone have any idea on how to create a transparent embossed watermark image in php GD. The watermark image will be placed in the center of the image. And it should be transparent so that the watermark is filled with the image background.

I have a script to add watermark. But its not transparent. Your help will be extremely useful for me.

Thanks in advance.

Simple little script.

Requires a watermark images and an image to be water marked. Also needs php-gd.

PHP Code:

class water_mark {

    public static function apply($watermark, $img) {

        header('content-type: image/jpeg');

        $watermark = imagecreatefrompng($watermark);
        $watermark_width = imagesx($watermark);
        $watermark_height = imagesy($watermark);
        $image = imagecreatetruecolor($watermark_width, $watermark_height);
        $image = imagecreatefromjpeg($img);
        $size = getimagesize($img);
        $dest_x = $size[0] - $watermark_width -5;
        $dest_y = $size[1] - $watermark_height -5;
        imagecopymerge($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_width, $watermark_height, 100);
        imagejpeg($image);
        imagedestroy($image);
        imagedestroy($watermark);
    }
}

water_mark::apply('watermark.jpg','tobemarked.jpg'); 


This currently just ouputs the image to the browser so if you wisj to link it into your document you would need to write your new image to dik.

Ibbo

Modify
imagejpeg($image);
to
imagejpeg($image,'image.jpg', 99); (where 99 is the image quality) but it does not require the last param
and you can then
echo "<img src='image.jpg' >";

remeber to comment out the header if you go for this method.


FINALY

Use png transparent backgroung image for your watermark. GD has removed gif format functionality.

Ibbo

Thanks for the code ibbo. But what I really want is an embossed image filled with the background image. Something similar to:-

http://www.codeguru.com/Cpp/G-M/bitm...icle.php/c1685

The above example is in C++. I want something similar in php.

Looks like your in luck.

PHP Code:

<?

class watermark {
   public static function emboss($pic1, $patt) {

      header("Content-type: image/png");
      $source = imagecreatefromjpeg($pic1); // Source
      $pattern = imagecreatefromjpeg($patt); // pattern

      list ($width, $height) = getimagesize($pic1);
      list ($widthpatt, $heightpatt) = getimagesize($patt);

      $new_width = $width;
      $new_height = $width / $widthpatt * $heightpatt;

      if ($new_height > $height) {
    $offset = intval(($new_height - $height) / 2);
      }elseif ($new_height < $height) {
    $offset = intval(($new_height - $height) / 2);
       } else {
       $offset = 0;
        }

    $image_p = imagecreatetruecolor($new_width, $new_height);
    $pattern = imagecreatefromjpeg($patt);
     imagecopyresampled($image_p, $pattern, 0, 0, 0, 0, $new_width, $new_height, $widthpatt, $heightpatt);

    $im = imagecreatetruecolor($width, $height);
        for ($y = 0; $y < $height; $y ++) {
       for ($x = 0; $x < $width; $x ++) {
         $colors = imagecolorsforindex($source, imagecolorat($source, $x, $y));
         $pattern_color = imagecolorsforindex($image_p, imagecolorat($image_p, $x, ($y + $offset)));
        
             //changes brightness depending on luminance
        if (($y + $offset +1) > 0 && ($y + $offset) < ($new_height -1)) {
          $brightness = abs(($pattern_color['red'] * 50 / 255) - 50);
           if ($pattern_color['red'] < 150) {
             $change = true;
           } else {
              $change = false;
              $tally = 0;
           }

           if ($change && $tally < 2) {
             $highlight = 1.8;
             $tally ++;
           } else {
             $highlight = 1;
           }
           $brightness = $brightness * $highlight;
        } else {
            $brightness = 0;
        }
        $r = (($colors['red'] + $brightness) > 255) ? 255 : ($colors['red'] + $brightness);
        $g = (($colors['green'] + $brightness) > 255) ? 255 : ($colors['green'] + $brightness);
        $b = (($colors['blue'] + $brightness) > 255) ? 255 : ($colors['blue'] + $brightness);
        $test = imagecolorallocate($im, $r, $g, $b);
        imagesetpixel($im, $x, $y, $test);
       }
        }

    imagepng($im);
    imagedestroy($im);
   }
}

watermark::emboss("apply-to-image.jpg", "pattern.jpg");

?>

This works as you want, apply-to-image.jpg been the image you wish to embosse and pattern been the pattern you wish to embosse.

This is not my code I found it (you got me interested). I have tested it and it does embosse an image upon another image as your example looks.

The apply-to-image.jpg can be any image BUT the pattern image is simply black text upon a white background.

Ibbo

Thank You very Very much Ibbo. That was exactly I was looking for. Thanks once again.