Quote:
Originally Posted by jimmyh1555
I used that process module ATrous in PI which supposedly gets rid of noise, but maybe I will fiddle more with those sliders next time. I used what I read in a tutorial - ie layer1, 3.000, 0.62, iterations 2
layer 2, 2.000, 0.62, iterations 2
layer 3, 1.0, 0.62, iterations 2
layer 4, 0.500, 0.62, iterations 1
All a mystery to me what that all means 
Thanks to you all! |
Noise reduction is best applied through a mask that protects the bright parts of the image (where the noise is already low.) A black clipped lightness mask is usually a good choice: extract lightness if you have a colour image, clip the blacks with HistogramTransformation, apply as a mask and then invert mask.
Cheers,
Rick.