I run a news web page based on Wordpress, and we often experience that people are downloading our author images and upload them elsewhere. That's no problem at all, if I could watermark uploaded images with an image on witch there would be our logo and web address, so we'd get some more traffic on our web page from the images floating around the web, thus earn some more $ that we desperately need for covering our running costs.
You can use this plugin for watermarking with image gallery "nextgen-gallery" and it is the plugin list for watermarking http://wordpress.org/extend/plugins/transparent-image-watermark-plugin/ http://wordpress.org/extend/plugins/watermark-reloaded/ http://wordpress.org/extend/plugins/watermark-my-image/ You need any other help so PM me or contact me on Skype/Gtalk: ashishkg17 It is my portfolio vrtechnologies.info/portfolio/ Thanks Ashish
nextgen gallery is the best available plugin which does everything you want to do with images on your wordpress site. Regards