I have a watermark ultra installed however the results vary a lot.
My watermark is http://www.angelescitymap.com/wp-content/uploads/site/Watermark-Logo-Transparent-500-x-58.png
Here are some examples of the results with 20% transparency.
Failed -
http://www.angelescitymap.com/wp-content/uploads/2012/09/Chiangmai-Restaurant-Menu-Page-Two.jpg
http://www.angelescitymap.com/wp-content/uploads/2012/09/Chiangmai-Restaurant-Menu-Page-One.jpg
http://www.angelescitymap.com/wp-content/uploads/2012/09/Chiangmai-Restaurant-Calling-Card-Contact-Numbers.jpg
Working -
http://www.angelescitymap.com/wp-content/uploads/2012/09/Swimming-Pool4.jpg
http://www.angelescitymap.com/wp-content/uploads/2012/09/Chiangmai-Restaurant-Calling-Card-Menu-Cover.jpg
http://www.angelescitymap.com/wp-content/uploads/2012/09/Chiangmai-Restaurant-Drinks-Menu.jpg
Any idea why this problem is ?
Thanks
Ian
http://wordpress.org/extend/plugins/transparent-image-watermark-plugin/