May 26, 2018
GIMP plugin to sharpen by increasing contrast in high frequency space
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.
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.
The plugin can be found under “Filters > Enhance > Wavelet sharpen”