Le nom du paquet est gimp-plugin-registry, à taper dans votre gestionnaire de paquet, et voici la liste des plugins qu’il contient:

* Add Film Grain (2.4):
    Helps adding realistic film grain to BW images.
  * Black and White Film Simulation (1.1):
    Converts the selected layer into Black and White using
    the channel mixer. Tries to produce results resembling
    tonal qualities of film.
  * Contact Sheet:
    Generates a contact sheet(s) for a directory of images.
  * David's Batch Processor (1.1.7):
    A simple batch processing plugin for The Gimp - it allows
    the user to automatically perform operations (such as resize)
    on a collection of image files.
  * Diana-Holga2 (3 juin 2008):
    Diana/Holga Toys Cameras effect simulator.
  * Exposure Blend (1.3b):
    Prompt for 3 images in a bracketed exposure series (e.g. 0,-2,+2 EV)
    and blend these into a contrast enhanced image.
  * Fix-CA (3.0.2):
    Corrects chromatic aberration in photos
  * Focus-Blur (3.1.5):
    This plugin tries to simulate an out-of-focus blur
  * GREYCstoration (2.8):
    A tool to denoise, inpaint and resize images
  * Layer-Effects (2.4):
    This script implements the following effects:
    add border, bevel and emboss, color overlay, drop shadow,
    gradient overlay, inner glow, inner shadow, outer glow,
    pattern overlay, satin.
  * Liquid Rescale (0.4.0-4):
    Content-aware rescaling. Keeps the features of the image while
    rescaling along a single direction.
  * Normalmap (1.2.1):
    Allows you to convert images into RGB normal maps for use in
    per-pixel lighting applications.
  * Planet Render (1-2):
    Creates a planet. Color, size and sun orientation
    can be set.
  * Refocus (0.9.1):
    The GIMP plugin to refocus images using FIR Wiener filtering.
    During image processing operations such as scanning and scaling, images
    tend to get blurry. The blurred impression of these images is due to the
    fact that image pixels are averaged with their neighbors. Blurred images
    don't have sharp boundaries and look as though they have been taken with
    an unfocussed camera.
  * Save for Web (0.28.5):
    Allows to experiment with various popular web format options. It shows
    an automatically updated preview and file size statistics.
  * Separate+ (0.5.1):
    Separate+ is a plug-in that generates color separations from an RGB
    image, proofs CMYK colors on the monitor and exports the CMYK TIFF file.
  * Smart Sharpen (redux) (2.4):
    This script implements the redux version of smart sharpening. It utilizes
    the Unsharp Mask or Refocus plugin to sharpen the image.
  * Streak-Camera simulation (0.6):
    A streak camera images an object through a slit -
    thus getting a "one dimensional image". This image is
    propagated along the second dimension of the image plane
    at a constant speed. The result is a picture of the time
    dependency of the object.
  * Wavelet Denoise (0.2-beta):
    The wavelet denoise plugin is a tool to selectively reduce noise in
    individual channels of an image with optional RGB<->YCbCr conversion.
    It has a user inteface to adjust the amount of denoising applied. The
    wavelet nature of the algorithm makes the processing quite fast.

Il faut dire que Gimp est plutôt pauvre pour débruiter et renforcer les détails, ce qui est gênant comparé aux capacités de Photoshop, mais ces plugins compensent cette lacune.

J’utilise le débruiteur par vaguelettes(Wavelet denoise) depuis peu et j’en suis plutôt satisfait, possibilité de travailler en mode Lab, et sur une seule couche.

Je ne les ai par contre pas tous essayé, et même peut-être en existe t-il d’autres?

Le lien ultime pour ces ressources à prospecter: http://registry.gimp.org/

C’était une aventure du monde libre : http://zipanatura.fr/logiciel-libre-photographie/