Flea
Too high a level of filtering can blur finer details in the image.
Technical Tutoria
2D filter set too high, seen a with split image. (left image unprocessed). The finer details are lost.
Adjusting 3D Temporal Filtering
Generally, 3D filtering requires little adjustment and should be set to a value of about 3. If you experiment with the setting, note that a low value will work with medium and fast moving images, while a high value will work with slow moving images. If the value is set high on moving images, the resulting images will have «image blur» and visible «image retention».
3D filter set too high, seen with a split image. (left image unprocessed). Image blur can occur.
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