BG-img in GD

  // The header line informs the server of what to send the output
  // as. In this case, the server will see the output as a .png
  // image and send it as such

  header ("Content-type: image/png");


  // Defining the background image. Optionally, a .jpg image could
  // could be used using imagecreatefromjpeg, but I personally
  // prefer working with png

  $background = imagecreatefrompng("backgroundimage.png");


  // Defining the overlay image to be added or combined.

  $insert = imagecreatefrompng("overlay.png");


  // Select the first pixel of the overlay image (at 0,0) and use
  // it's color to define the transparent color

  imagecolortransparent($insert,imagecolorat($insert,0,0));


  // Get overlay image width and hight for later use

  $insert_x = imagesx($insert);
  $insert_y = imagesy($insert);


  // Combine the images into a single output image. Some people
  // prefer to use the imagecopy() function, but more often than
  // not, it sometimes does not work. (could be a bug)

  imagecopymerge($background,$insert,0,0,0,0,$insert_x,$insert_y,100);


  // Output the results as a png image, to be sent to viewer's
  // browser. The results can be displayed within an HTML document
  // as an image tag or background image for the document, tables,
  // or anywhere an image URL may be acceptable.

  imagepng($background,"",100);

// The header line informs the server of what to send the output
  // as. In this case, the server will see the output as a .png
  // image and send it as such
 
  header ("Content-type: image/png");
 
 
  // Defining the background image. Optionally, a .jpg image could
  // could be used using imagecreatefromjpeg, but I personally
  // prefer working with png
 
  $background = imagecreatefrompng("backgroundimage.png");
 
 
  // Defining the overlay image to be added or combined.
 
  $insert = imagecreatefrompng("overlay.png");
 
 
  // Select the first pixel of the overlay image (at 0,0) and use
  // it's color to define the transparent color
 
  imagecolortransparent($insert,imagecolorat($insert,0,0));
 
 
  // Get overlay image width and hight for later use
 
  $insert_x = imagesx($insert);
  $insert_y = imagesy($insert);
 
 
  // Combine the images into a single output image. Some people
  // prefer to use the imagecopy() function, but more often than
  // not, it sometimes does not work. (could be a bug)
 
  imagecopymerge($background,$insert,0,0,0,0,$insert_x,$insert_y,100);
 
 
  // Output the results as a png image, to be sent to viewer's
  // browser. The results can be displayed within an HTML document
  // as an image tag or background image for the document, tables,
  // or anywhere an image URL may be acceptable.
 
  imagepng($background,"",100);