![]() Corner pinning – used to replace one logo with another – generally requires four trackers. ![]() More accurate tracking is achieved by adding more point trackers. ![]() The information generated by tracking results in keyframe data that can be applied to stabilize shots, corner pin objects or to moving masks for filters and other effects. Often tracks have to be manually adjusted. If the tracked point moves off screen or out of focus, most point trackers will have trouble following and new tracker targets have to be picked where the first track leaves off. As the object moves through the frame, the tracker hopefully stays “locked” onto this target area while the software does an analysis pass of the video clip. Usually this is an area of a few pixels with a high contrast difference, like a clear logo or sign in the frame that moves with the object you are tracking. You isolate one or more obvious targets on an image and position a tracker over it. So, why buy another? All of these trackers are “point” trackers. Avid Media Composer, Apple Motion and Adobe After Effects all include built-in trackers. Many software packages already include tracking technology. This year Imagineer released mocha for Final Cut Pro, bringing the same tracking power to FCP editors. If you purchased one of Adobe’s Creative Suite 4 bundles that included After Effects, then you already own mocha for After Effects, whether you know it or not. Mocha, a 2D standalone tracker, is one of their better known products. Tracking is the key to believable visual effects and one of the leaders in this technology is Imagineer Systems.
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