http://kentweakley.com/blog/add-custo...
There are numerous ways to add a watermark to your photographs. Lightroom offers a speedy way to add your text watermark or custom watermark or logo to each image upon export. Let me show you all the details to this technique in Lightroom. I'll even show how to create the custom watermark in Photoshop so it will be properly prepared and ready for use on your photographs.