AEM as a Cloud Service’s watermarking capabilities allows custom image renditions to be watermarked using any PNG image.
The following OSGi configuration stub can be updated and added to your AEM project’s ui.config
sub-project.
/apps/example/osgiconfig/config.author/com.adobe.cq.assetcompute.impl.profile.WatermarkingProfileServiceImpl.cfg.json
{
"watermark": "/content/dam/path/to/watermark.png",
"scale": 1.0
}