[G4] 이미지에 워터마크 넣기 > 기술자료

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bbs/write_update.php 
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109~164행 추가 
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// 이미지에 워터마크 넣기 
// PHP > 4.0, GD > 2.0.1 
// WatermarkImage("원본이미지","겹처지는이미지","투명도","화질",[겹치는이미지위치(0,1,2)]); 
function WatermarkImage($CanvasImage, $WatermarkImage /* MUST BE PNG */, $Opacity=30, $Quality=70, $WatermarkLocate=1) 
{ 
  // create true color canvas image: 
  $canvas_src = imagecreatefromjpeg($CanvasImage); 
  $canvas_w = ImageSX($canvas_src); 
  $canvas_h = ImageSY($canvas_src); 
  $canvas_img = imagecreatetruecolor($canvas_w, $canvas_h); 
  imagecopy($canvas_img, $canvas_src, 0,0,0,0, $canvas_w, $canvas_h); 
  imagedestroy($canvas_src);    // no longer needed 

  // create true color overlay image: 
  $overlay_src = imagecreatefrompng($WatermarkImage); 
  $overlay_w = ImageSX($overlay_src); 
  $overlay_h = ImageSY($overlay_src); 
  $overlay_img = imagecreatetruecolor($overlay_w, $overlay_h); 
  imagecopy($overlay_img, $overlay_src, 0,0,0,0, $overlay_w, $overlay_h); 
  imagedestroy($overlay_src);    // no longer needed 

  // setup transparent color (pick one): 
  $black  = imagecolorallocate($overlay_img, 0x00, 0x00, 0x00); 
  $white  = imagecolorallocate($overlay_img, 0xFF, 0xFF, 0xFF); 
  $magenta = imagecolorallocate($overlay_img, 0xFF, 0x00, 0xFF);  
  // and use it here: 
  imagecolortransparent($overlay_img, $white); 

  // 워터마크 이미지의 위치(기본값은 가운데 1입니다.) 
  switch ($WatermarkLocate) { 
case 0:  // 좌측상단 
  $ww = 0; 
  $wh = 0; 
  break; 
  case 1: // 가운데 
  $ww = ($canvas_w / 2) - ($overlay_w / 2); 
  $wh = $canvas_h - ($overlay_h); 
  break; 
  case 2: // 우측하단 
  $ww = $canvas_w - ($overlay_w); 
  $wh = $canvas_h - ($overlay_h); 
  break; 
} 

  // copy and merge the overlay image and the canvas image: 
  imagecopymerge($canvas_img, $overlay_img, $ww,$wh,0,0, $overlay_w, $overlay_h, $Opacity); 

  imagejpeg($canvas_img, $CanvasImage, $Quality); 
/* 
  // output: 
  header("Content-type: image/jpeg"); 
  imagejpeg($canvas_img, '', $Quality); 
*/ 
  imagedestroy($overlay_img); 
  imagedestroy($canvas_img); 
} 
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238~241행 추가 
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// WatermarkImage("원본이미지","겹처지는이미지","투명도","화질",[겹치는이미지위치(0,1,2)]); 
            // 겹치는이미지위치값이 0이면 좌측상단, 1이면 가운데, 2이면 우측하단 
            $overfile = "$g4[path]/overlay.png"; 
            WatermarkImage("$dest_file", $overfile, 40, 70, 1); 
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//워터마크기능 


원작성자 : 후룬  https://sir.kr/g4_tiptech/2979