The FZ1 can use either matrix or spot evaluation. See also What does the [SPOT] mode do?.
In matrix mode, the light reflectance of the whole scene is averaged out and the result is assumed to be equal to a middle tone (a shade that reflects 18% of the light that hits it). If the actual scene is lighter or darker than a middle tone, the camera will respectively under-expose or over-expose the picture (unless the user compensates the exposure). In spot mode, only a small area in the centre of the frame is metered. When you point the spot at different lighting levels in a scene, you may notice the colours changing intensity. You can use this to your advantage pan around and when you find the combination you like, half-press the shutter release button to lock the desired exposure, re-compose and shoot.
