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Wavelet sharpen

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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.


  • Graphical user interface
  • Preview image
  • Option to sharpen luminance channel only
  • Selectable sharpen radius
  • Lossless image conversions


The wavelet decomposition of an image results in multiple images with different frequency content. When amplifying the high frequency parts the recomposed image appears to be sharper than the original one. That way the frequency which should be amplified most can also be selected and a given unsharpness in the original image can be taken into account.

This GIMP plugin allows to perform this wavelet decomposition and allows the user to adjust the amount of sharpening and the radius of unsharpness in the original image. As an option you can sharpen the luminance channel of the YCbCr converted image only which reduces colour artifacts to appear (especially in noisy images). The sharpness of the colour contrast is not critical to the human eye.


This picture was taken with the Nikon D80 and the Nikkor AF 50mm 1:1.8 lens fully open. Because the image is slightly out of focus and due to the wide apperture and aliasing the image is not quite sharp.


The plugin is distributed under the General Public License (GPL) version 2 and newer.

wavelet-sharpen-0.1.2.tar.gz17.72 KB
GIMP Version: 
Code License: 


1. Very big thanks for this plugin. It is what I have wanted for years: a sharpen which does not emphasize the noise. 2. Big thanks for the install instructions. 3. The plugin works with 2.6.

Can anybody show me how to install this (wavelet-sharpen) into GIMP 2.4x under WindowsXP? Can the file somehow be converted to the .scm format whereby it can be easily loaded into GIMP and utilized? Thanks in advance

This is a plugin, not a script, vey52. You must compile it with Msys/MinGW. The command is: gimptool-2.0 --install-admin wavelet-sharpen.c if you want to have it installed in your gimp plugin directory, or gimptool-2.0 --build wavelet-sharpen.c, if you only want to get the binary. Here is a link to download the compiled Win32 exe I have just built: Hope this works. I'll put it in a more regular repository later. You just have to copy the file wavelet-sharpen.exe into one of these directories: C:\Program Files\GIMP-2.0\Gimp-2.0\lib\gimp\2.0\plug-ins\ or c:\Documents and Settings\username\.gimp-2.6\plug-ins\ François Collard.

Compiling the new version is a bit harder. I'll upload a new Win32 binary shortly.

I may upload very soon Before i will like some more info the developer talk about 1 plugin then on the messages are references to 2 plugins wawelet denoise and wawelet sharpen. So is 1 plugin with 2 possible functions or are 2 similar but separate plugin ? (if the last maybe will be more convenient merge in a single GUI with 2 Tabs )

Sophos antivirus keeps picking up this add in as containing a virus. I've uploaded this plug-in to "Total Virus", which is a multiple antivirus checker, and it keeps coming up with containing a very hard to get rid of trogan. Test this yourselves to see what I mean.


Doesn't Virustotal provide a link to the scan results? Please add the url here.


I checked the file again, and the trogan has been removed (thank you for doing this...)

Here is the Virus Total Results:

James Chisholm

You're sure that the file has changed rather than the Antivirus vendors finally resolving a false positive?


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