An odd one this but I hope somebody can help. I'm building a site for a civic society and want to use a brick fill as a background. So far so good, however, the brick fill is a bit too prominent (ie fairly good quality) and detracts a bit from the main page. Is there any way I can reduce the quality of the graphic a bit, for example reduce brightness - I can't seem to use any of the graphic tools to change the background.

Many thanks