Can Your Audience Trust Your Web Site?
http://builder.cnet.com/webbuilding/pages/Business/Paul/091698/

Paul, Fredric
Builder.com
1998

Abstract:

Convincing photo manipulation is not quite as easy as it's made out to be. Adding something to a photo, for example, is much harder than removing existing items. And while it often makes sense to expend time and effort on this for advertising, it's not cost-effective, despite inexpensive software, for most journalistic or political purposes.