Drupal 7 Photo sizing

  // is this a photo stored in the site (for a Person node)?
  // if so, we can use Image Styles to generate the different sizes needed
  if(strpos($photo_uri,"public:") === 0){
    $regular = image_style_url($preset,$photo_uri);
    $retina = image_style_url($preset . "_2x",$photo_uri);
    $img_properties = image_get_info(image_style_path($preset, $photo_uri ));
    $photo_height = $img_properties['height'];
    $photo_width = $img_properties['width'];
  } else {
    // We have to explicitly specify the dimensions for photos coming from the photo services feed
    // which are generally 5x7 and will be padded to fill the extra space
    if($preset == "barista_person_list_thumbnail"){
      $photo_width = 128;
      $photo_height = 180;
    } elseif($preset == "barista_person_photo_grid_thumbnail"){
      $photo_width = 128;
      $photo_height = 180;
    } else {
      $photo_width = 190;
      $photo_height = 264;
    }
    $regular = str_replace(array("WIDTH","HEIGHT"),array($photo_width,$photo_height),$photo_uri);
    $retina = null;
  }