How to add a new template ?
Copy and paste artist.php, then rename it to myfilter.php.
Open myfilter.php, assign the width and height of your png file to both variables $canvaswidth and $canvasheight.
Assign the desired width and height of the uploaded picture at line 8, 12 and 13 :
$dst = @imagecreatetruecolor(WIDTH, HEIGHT);
$dst_width = WIDTH;
$dst_height = HEIGHT;
Set the left/top coordinates of the uploaded image at line 30 :
Set the url to the png image at line 32 : $png = ”../props/IMAGENUMBER.png”;