Konica Minolta DIMAGE Z5 - Manual (Page 39)

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Noise can be apparent when using a slow shutter speed or
high camera sensitivity (ISO), or using the camera in hot
environment. In these cases, noise-reduction is applied to the
image automatically. A message appears on the LCD monitor
if the noise-reduction processing period is long. A picture
cannot be taken while this message appears.
When the camera is hot, allow the camera to cool before
taking pictures.
NOISE REDUCTION
Processing...