그림에 출처표시 합성하기 (Put Watermark On Images Using Php)
$size=getimagesize($SourceFile);
$image = imagecreatefromjpeg($SourceFile);
$watermark = imagecreatefromgif('watermark.gif');
$watermark_width = imagesx($watermark);
$watermark_height = imagesy($watermark);
$dest_x = rand (5, $size[0] - $watermark_width - 5);
$dest_y = $size[1]- $watermark_height - 5;
imagecopymerge($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_width, $watermark_height, 30);
imagejpeg ($image, $SourceFile, 100);
imagedestroy($image);
imagedestroy($watermark);