Hi, At high iso darktable gives for both the wavelet solution (spikes) as the non-local means (patches) solution ugly strutured noise output for my NEX_C3. I noticed also some ugly colorshifts in deep shadows going partially green or purple. However having a look at the denoisified results of Lightroom output for my NEX-C3 I noticed the typical spikes from the wavelet output as well as much more randomized noise. I succesfully combined the wavelet and non-local means denoising profiles (3 instances) to get a much nicer result very similar in quality to Lightroom. Lightroom however seems to keep slightly more structure, I assume they have an adaptive coupling between my multiple instances.
Here is my approach (note the order of instances matters) for the denoising profiles instance 0: wavelet, 100%, strength 1 on the color. instance 1: wavelet, 50%, strength 1 on the lightness. instance 2: non-local means, 50%, strength 1 on the lightness. the non-local means is an adaptive filtering and hence works best as the last filter. Some documentation on the darktable manual of this would perhaps safe others the time and effort. I can supply darktable exported jpegs of before and after per email. Some color blotches remain, which I usually filter out with the bilateral filter on the color. I suspect the denoising profile for the NEX-C3 can be made more accurate to solve this and the odd color shifts in the shadows. Though I might suspect that there are processing differences between different white balances. The out of camera jpegs seem to suffer none of this so I expect this to be possible. Best, Gert -- Panta Rhei -- Life is a dance ------------------------------------------------------------------------------ See everything from the browser to the database with AppDynamics Get end-to-end visibility with application monitoring from AppDynamics Isolate bottlenecks and diagnose root cause in seconds. Start your free trial of AppDynamics Pro today! http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
