noise reduction

G'MIC plug-in

dtschump — Tue, 13 Jan 2009 14:16:31 +0100

The G'MIC plug-in for GIMP defines a set of various filters, including artistic filters, image denoising and enhancement, 3D renderers, etc.. It is a quite large plug-in, integrating a lot of different effects to apply.

This plug-in is able to update his list of filter definitions from the Internet (so it improves itself over time), as well as allows any user to add its own custom filters in it.
It has been written by the author of the GREYCstoration algorithm (used for image denoising). It is actually intended to replace it in a near future.

Download G'MIC for Windows 32 bits

Here is one screenshot of the plug-in in action, as well as a result of filter application :

GREYCstoration

dtschump — Fri, 11 Jan 2008 12:00:40 +0100

GREYCstoration is a noise reduction plug-in.
It allows to remove noise (grain) or small artefacts (JPEG blocks effect) from color images. It is based on anisotropic diffusion partial differential equations.

Algorithm code done by David Tschumperlé.
Plug-in code done by Grzegorz Szwoch.
Pre-compiled versions available for Linux, Windows.

ISO noise reduction

eg — Mon, 07 Jan 2008 13:51:14 +0100

Implements an ISO noise reduction as described in the tutorial below, also this script uses different methods (masking the edges and then blurring the individual color channels or the luminance channel only)

Tutorial: http://www.gimpguru.org/Tutorials/ReducingCCDNoise/

PS - Using a plugin like Wavelet denoise from http://registry.gimp.org/node/4235/ or greycstoration from http://www.greyc.ensicaen.fr/~dtschump/greycstoration/ might actually give you better results and more options for fine tuning.