This is a good time to denoise the color channels. Because luminance noise is all gone now (though we haven't recovered any detail yet), we can see color noise very clearly.Increase the slider or curve just until the luminance noise has been smoothed away. Decide whether you just want to work with the Luminance slider, or whether you want to use the Luminance Curve for finer control.Start by setting the Luminance Detail slider to 0,.Zoom into the photo to 100% and find an area that has both sharp in-focus parts as well as large plain out-of-focus ones, so that you can prevent noise reduction from destroying details as you tweak it.If you're using Contrast by Detail Levels to give the image more depth, make sure that the first " 0 (Finest)" slider, and probably the second one " 1" too, are turned off. Check the sharpening tools to make sure that you're not sharpening any fine detail, because your noisy photo has no fine detail! All they would do is amplify the noise. To find the best set of Noise Reduction values for your image: They will prevent false maze patterns from appearing, and prevent the image from looking washed-out due to heavy noise reduction. When working with very noisy, high ISO images, it is recommended to use the LMMSE or IGV demosaicing methods. Read on to learn how to use it efficiently. It uses wavelets, a Fourier transform and a median filter to work its magic. RawTherapee's powerful Noise Reduction tool caters to all your needs - it lets you eliminate noise while retaining detail. Some like a completely clean, smooth result, while others prefer to have some grain left over to give the photo a more film-like quality. Not everyone's requirement for good noise reduction is the same.
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