Hi,
I cannot find functionnality for specify watermark image by image instead Album by Album.
Is it possible to specify watermark only for one image in album ?
Thanks for advance, David.

You can specify an watermark only on the album level and/or globally. You could try to set an image by setting a temporary watermark using setOption().

Thank Acrylian, If you have any time, please post example.

Try something like this at the beginning of the page (I have not tried if it really works!):
if (getOption('perform_watermark')) { setOption('watermark_image','',false); // must be in the watermarks folder of course }