Tuesday, September 20, 2022

Wavelet denoise Ver.0.3.1 Win_64bit


Author: Marco Rossini

Source code:  Archive GIMP Plugin Registry  https://github.com/pixlsus/registry.gimp.org_static

In menu: Filters ➤ Enhance ➤ Wavelet denoise ...

The wavelet denoise plugin is a tool to reduce noise in each channel of an image separately.

From the plugin author's information:

It works for both Grayscale and RGB (full colour) images, including alpha channels. The plugin dialog allows to adjust several parameters.

1. First, the choice has to be made over what colour model is to be used. There   are three possibilities (maybe there will be more in the future):

   a) RGB     (red-green-blue)
   b) YCbCr   (luminance-blueness-redness)
   c) CIELAB  (lightness-chroma)

   YCbCr and CIELAB allow separate reduction of luminance and chroma (colour) noise.

2. The preview mode can be selected. Either all channels can be selected or the current active channel which is then displayed in grayscale or colour.
3. Select the channel you want to denoise.
4. The sliders adjust the the threshold for denoising. The softness controls the softness of the thresholding. The greater the softness, the more noise remains in the image.

For camera pictures I advise to use YCbCr mode (which is nearly lossless) and to at least denoise the Cb and Cr channels to reduce the chroma (colour) noise.
Cameras shooting in JPEG mode normally have chroma noise already reduced. If desired, the luminance noise can be reduced. This channel usually contains most of the fine structures in the image and should mostly be left alone.

Compiled for Gimp-2.10 by Samj.

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