![]() This algorithm (origin Ipol 2014 ) was ported to ART by Alberto Griggio and improved by Ingo Weyrich, Jacques Desmis adapted it to RawTherapee.Improvements with "Non-local means" - also called patch-based denoise (Local Adjustments tab) February 2021. Ability to use L*a*b* mode instead of RGB mode.2 additional curves to process more finely the luminance and chrominance noise - 'y' axis = amplitude, 'x' axis = luminance or chrominance intensity.Automatic calculation of noise suppression settings.Improvements to the general noise reduction module (Noise Reduction - Detail tab) Addition of a DCT threshold to take into account the edge effect (origin ART ).Ability to extend the DCT Fourier processing to chrominance.Ability to denoise at pixel level by taking into account the luminance and chrominance.Possibility of denoising by level of decomposition.Several improvements were made by Ingo Weyrich and Jacques Desmis: Note that in the beginning, the Noise Reduction module was at the end of the process (this was also the case for the PerfectRAW product which I worked on with E.Martinec and M.LLorens).Įnhancements to original features carried out between 2012 & 2020 Using automatic tiling for both wavelet and DCT operations to reduce memory requirements.Using luminance and chrominance with a single slider for each.These 2 functions were contained in a general module (Noise Reduction in the Detail tab): Fourier processing for luminance noise using DCT (Discrete Cosine Transform) to process the residual noise (equal to the difference between the original image and the wavelet-denoised image).One or two passes ("conservative" and "aggressive").Global noise assessment - per decomposition level - using MAD (median absolute deviation).identical for all decomposition levels and for the whole range of luminance or chroma values. Wavelet processing with the following characteristics:.These functions were originally designed to provide: It is composed of basic functions (Wavelets, DCT) which can also be called by other programs, such as Wavelet Levels and Local Adjustments. We will look at the first two: Wavelets & Fourier. ![]() Tools initially designed by Emil Martinec in 2012 located in "". This information is complementary to the existing documentation, which can be found in the relevant sections of Rawpedia. To put the Local Adjustments denoise tools into context, it is useful to summarize the other denoise tools available elsewhere in RawTherapee (Detail and Wavelets tabs) and to provide some additional information on the algorithms used. 12.1.13 Recovery based on luminance mask (uses data before and after denoise processing).12.1.12 Chroma detail recovery (DCT – uses Fourier transforms and wavelets).12.1.11 Equalizer Blue-yellow /Red Green (uses wavelets).12.1.8 Non-local means - patch-based denoise.12.1.7 "Edge detection - DCT" > Luma and chroma detail threshold (DCT f - uses Fourier transforms and wavelets).12.1.6 Denoise based on luminance mask (uses data prior to wavelet processing).12.1.5 Denoise hue equalizer (uses data prior to wavelet processing).12.1.4 Equalizer white-black (uses data prior to wavelet processing).12.1.3 Luma detail recovery (DCT f - uses Fourier transform and wavelets).12.1.2 Luminance denoise by level (uses wavelet processing).12.1.1 Aggressive / Conservative mode (uses wavelet processing).10.3 Blur/Grain & Denoise (Local Adjustments tab).10.2 Denoise & Refine (Wavelet Levels, Advanced tab).10 Main characteristics of the various RawTherapee noise reduction tools.7 Where should the denoise functions be located?.5 Improvements with "Non-local means" - also called patch-based denoise (Local Adjustments tab) February 2021.4 Improvements to the general noise reduction module (Noise Reduction - Detail tab).3 Enhancements to original features carried out between 2012 & 2020.
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