GIMP Plugin Registry

This script does LAB sharpening using the unsharp mask in the luminance (L) layer. It decomposes the image into LAB layers, sharpens the luminance layer (using the supplied settings), and then recomposes the image. The interface is the same as the unsharp mask (radius, amount, threshold), but the filter is only applied to the luminance layer.

This script sharpens an image using some simpel layer manipulations. It offers a Radius and a strength operator to increase strength vs quality. I also added a simpel brightness correction in order to remove highlights created by a too high sharpening value. IT's therefore recommended to increase the correction value when increasing the strength value a lot.

This plugin is not more maintained but still works very well On Gimp 2.6 and even 2.7
Was developed by Peter Heckert , Windows binary were provided by Michael Schumacher.  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 »

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 implements a sharpening technique as described at
http://digitalphotographer.com.ph/forum/showthread.php?t=1085
This is Manny Librodo's Sharpening moves. You can give it a try and you will be surpised with the quality. One caveat, there really is no one set formula for sharpening so you may want to experiment with different amounts for different images.

The wavelet sharpen plugin enhances apparent sharpness of an image by increasing contrast in high frequency space. The amount of unsharpness of the original image can be taken into account by adjusting the sharpening radius. As an option you can choose to sharpen the luminance (YCbCr) channel of the image only.  read more »

About

"Scale in steps" resizes an image to the given dimensions in several steps to get a way sharper result compared to resizing in one step. The step size is given in percent and should range between seven and ten percent.

Samples

None of the sample images are sharpened. The original picture was 3000×2000.

baerm_s5.jpg

Stepsize: 5%

baerm_s.jpg

Stepsize: 10%

baerm_f.jpg

Traditional scaling

This script simulates a high quality (portrait) photo like these from the National Geographic.
Copy it into the scripts folder from GIMP, you will find it then under Filters -> Generic -> National Geographic.  read more »

Implements the redux version of smart sharpening

Tutorial: http://www.gimpguru.org/Tutorials/SmartSharpening2/

The Refocus plugin from http://hphsite.de/refocus/ must be installed seperately if you want to use this option in the script.