Description:
Puts a watermark on an img (i.e. photo.jpg) on-the-fly using PHP-GD.

Before:

filename » photo.jpg

After:

filename » img_copyright.php?img=photo.jpg

filename » img_copyright2.php?i=photo.jpg

pt.2 | *home

Extra Links:
» PHP getimagesize() - Manual
» Storage and re-use of images using PHP-GD

Code (img_copyright.php):

<?	  
// Set the static variables
$font_file = "fonts/04b_21.ttf";
$font_size = 6;
$angle = 0;
$text = "TEST.COM";

// The dummy image hack
$im_size = getimagesize($img);
$image_width = $im_size[0];
$image_height = $im_size[1];

$im = imagecreatetruecolor($image_width, $image_height);
$white = imagecolorallocate($im, 255, 255, 255);
$black = imagecolorallocate($im, 0, 0, 0);
$im2 = imagecreatefromjpeg($img);
imagecopy($im, $im2, 0, 0, 0, 0, $image_width, $image_height);

// Position the text
$bounding_box = imagettfbbox($font_size, 0, $font_file, $text);
$x_start = $image_width - $bounding_box[2] - $bounding_box[0] - 10;
$y_start = $image_height - 10;

// Write the text to the image
imagettftext($im, $font_size, $angle, $x_start, $y_start, $black, $font_file, $text);
$x_start -= 1; $y_start -= 1;
imagettftext($im, $font_size, $angle, $x_start, $y_start, $white, $font_file, $text);

// Create and then destroy the image
if (imagetypes() & IMG_GIF) {
   header("Content-type: image/gif");
   imagegif($im);
} elseif (imagetypes() & IMG_JPG) {
   header("Content-type: image/jpeg");
   imagejpeg($im, "", 100);
} elseif (imagetypes() & IMG_PNG) {
   header("Content-type: image/png");
   imagepng($im);
} elseif (imagetypes() & IMG_WBMP) {
   header("Content-type: image/vnd.wap.wbmp");
   imagewbmp($im);
} else {
   die("No image support in this PHP server");
}

// Destroy GD created images
imagedestroy($im);
imagedestroy($im2);
?>

Code (img_copyright2.php):

Status:
Hmmm....check out the file-sizes of the original, and the 2 other after-images...