Image Management.Watermarks

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Watermarks are visible embedded overlay on a digital photo consisting of text, a logo, or a copyright notice that discourages others from taking your digital images and using them without your permission.

In the example below this png image is used as a watermark for the iPhone photos.
To implement such a possibility, it is necessary to provide some event handlers. Technical details are as follows (click a link below to see the appropriate code):

OnBeforePageExecute event handler code.
OnCustomRenderColumn event handler code.

    function getImageWithWatermark($imagePath, $watermarkPath) {
      list($sourceWidth, $sourceHeight) = getimagesize($imagePath);
      
      $resultImage = imagecreatetruecolor($sourceWidth, $sourceHeight);
      imagesavealpha($resultImage, true);
      $background = imagecolorallocatealpha($resultImage, 0, 0, 0, 127);
      imagefill($resultImage, 0, 0, $background);
    
      $sourceImage = imagecreatefrompng($imagePath);  
      imagecopy($resultImage, $sourceImage, 0, 0, 0, 0, $sourceWidth, $sourceHeight);
      
      $watermarkImage = imagecreatefrompng($watermarkPath);
      imagecopy($resultImage, $watermarkImage, 0, 0, 0, 0, imagesx($watermarkImage), imagesy($watermarkImage));
    
      ob_start();
      imagepng($resultImage);
      $imageData = ob_get_contents();
      ob_end_clean();
      
      return $imageData;
    }

        protected function doCustomRenderColumn($fieldName, $fieldData, $rowData, &$customText, &$handled)
        { 
            if ($fieldName == 'photo_large' && !empty($fieldData)) {
              $imagePath = sprintf('external_data/images/phone/iphone_large/%s', $fieldData);
              if (FileUtils::FileExists($imagePath)) {
                $watermarkPath = 'external_data/images/watermark.png';
                $imageData = base64_encode(getImageWithWatermark($imagePath, $watermarkPath));
                $src = 'data:image/png;base64,'.$imageData;
                $customText = str_replace($imagePath, $src, $customText);
                $handled = true;
              }
            }
        }

Model Name	Apple iPhone 12 Pro Max
Release Year	2020
Display Size	6.7
Colors	Gold,Silver,Graphite,Pacific Blue
Photo

Model Name	Apple iPhone 12 Pro
Release Year	2020
Display Size	6.1
Colors	Gold,Silver,Graphite,Pacific Blue
Photo

Model Name	Apple iPhone 12
Release Year	2020
Display Size	6.1
Colors	Black,Blue,Green,Red,White
Photo

Model Name	Apple iPhone 12 mini
Release Year	2020
Display Size	5.4
Colors	Black,Blue,Green,Red,White
Photo

Model Name	Apple iPhone SE (2020)
Release Year	2020
Display Size	4.7
Colors	Black,Red,White
Photo

Model Name	Apple iPhone 11 Pro Max
Release Year	2019
Display Size	6.5
Colors	Gold,Midnight Green,Silver,Space Gray
Photo

Model Name	Apple iPhone 11 Pro
Release Year	2019
Display Size	5.8
Colors	Gold,Midnight Green,Silver,Space Gray
Photo

Model Name	Apple iPhone 11
Release Year	2019
Display Size	6.1
Colors	Black,Green,Purple,Red,Yellow,White
Photo

Model Name	Apple iPhone XS Max
Release Year	2018
Display Size	6.5
Colors	Gold,Silver,Space Gray
Photo

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