Blue Crowbar Software is a small Belgian Mac development firm that is quickly making a name for itself for its innovative iPhoto and Aperture plugins. We've previously covered iPhoto2Twitter here on TUAW, and now Blue Crowbar has announced a new iPhoto plugin for adding watermarks to pictures in your iPhoto library.
Watermarks are those faint, transparent designs that websites often use to mark exclusive photos when breaking a big story. For example, many of the great fake iTablet "photos" that we've received during the past few weeks have been emblazoned with a watermark for one Mac site or another. Impression (€9.90 -- about US$14.10) works in iPhoto to put watermarks onto your iPhoto pictures. If you're worried that a watermark might ruin a perfectly good picture, don't be. Impression makes a copy of the picture, then creates a watermarked version which is also saved into your iPhoto library.