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This script helps fix overblown areas of an image. It's not as good as some other methods that must be done manually, but it's not bad. It will NOT fix clipped colors (maximum overblown areas); it only helps increase the contrast in bright highlights.
The script is located in "<Image> / Script-Fu / Enhance / Fix Overblown"
Feedback welcome!
This script helps fix noise found in digital camera pictures.
There seems to be some confusion as to what all this script does... read more »
FX-Foundry/Color/Separate Luminance...
Creates two new layers: one containing the Luminance, and the other the Chroma information in the form of a Grain Merge. Optionally, it will color-enhance (maximize saturation in) the Chroma layer while still keeping it luminance-neutral.
This allows you to do noise-reduction and sharpening on the two layers separately.
Update (23-Jul-2009):
Noticed that highly-saturated colors exceed the ability of the grain-extract/grain-merge to handle without clipping the color, so I have made the excess color get folded into the luminance layer. read more »
FX-Foundry/Photo/Enhancement/Maximize Local Contrast... Like Stretch Contrast, but instead of using the minimum and maximum pixel values from the entire image, uses the minimum and maximum in the vicinity of a pixel to compute its new value. Takes a while to run, but really brings out textures. Result is a Grain Merge layer that adjusts values of the original image.
This filter operates on the visible image, not on a layer or selection. read more »
The G'MIC plug-in for GIMP defines a set of various filters, including artistic filters, image denoising and enhancement, 3D renderers, etc.. read more »
Windows 32 binary of the last version of this plugin written by "wavelet" Marcor ;)
A new Windows compilation of the last version of this fine plugin written by Marcor.
No console window. Compiled with LDFLAGS=-mwindos as usual.
This plugin losslessly decomposes a layer of an image into layers of wavelet scales. This means that you can edit the image on different detail scales (frequencies). The trivial recomposition of the image can be done by GIMP's layer modes so you can see the results of your modifications instantly. Among the applications are retouching, noise reduction, and enhancing global contrast. read more »
This script acts as a red fitler on diving photos.
To launch it, goto the menu /Script-Fu/Enhance/Diving red filter
Basically, create a new layer containing the corrected picture
You can adjust the red level (sometimes, green might works better !)
and set if the white balance has to be performed...
Enjoy !
Example :
(Copyright: Thomas Amory - right: before/Left: after)

(Copyright: Thomas Amory - right: after/Left: before) read more »