7. The Menus / 7.7 The Filter Menu
7.7.40 Digital Camera/Denoise
Images are called noisy, if areas, that are single-colored in reality, contain
many different color and intensity values. Usually you get noisy images, if
you take a picture by using a digital camera and the light is to weak and/or
the exposure time is to short.
The Denoise-dialog has two parts:
- Color Noise
- The human eye is not very sensitive to color changes, therefore at first
sight these settings don‘t show much effect. But if you set the filter size
to high, the edges in your image may become gray.
- Intensity Noise
- Reduction of intensity noise is a two-sided sword: on the one side the
noise will be reduced, but on the other side the image may become
unsharp. In order to avoid this there is Threshold. Threshold defines the
minimum value for reducing noise. 0% doesn‘t reduce anything. Usually
this value should be - depending on the image - between 4% and 10%.