title: PHP Image Upload Resize, Watermark, Title & Copyright Info
body: <p>Ive written an image upload and resize script for my website which allows users to upload images, and then the script resizes the images in 3 different sizes and adds a watermark image (my website logo) on the top.</p>
  
  <p>The problem I have is, that if a user then tries to upload one of the resized photos again, it will then add the logo watermark on top of it again.</p>
  
  <p>What I want is to maybe add some information to the uploaded image (i.e. author, which I could set to my website name), so that if a user uploads an image which has already been watermarked, I can put a check in my script so that I dont add the watermark logo again.</p>
  
  <p>Is this possible with PHP?</p>