You can have Sprout Studio automatically apply a watermark to your photos in a gallery. A Watermark in a gallery is a combination of:
The placement of your logo.
The opacity of your logo as it's placed on your photos.
Go to Settings > Galleries & Designs > Watermarks to create, edit and manage your watermarks. To enable watermarks for a gallery, choose a watermark from the "Watermark" dropdown in the "Settings" panel while editing a gallery.