Usage: sharpen(sharpen_amount,sharpen_radius,luminance_only)
This filter enhances apparent sharpness of the image. It's heavily based on Marco Rossini's excellent Wavelet sharpen GIMP plugin. Check http://registry.gimp.org/node/9836 for details about how it work.
sharpen_amount- Sharpen amount. Typical values are between 0.0 and 10.0.sharpen_radius- Sharpen radius. Typical values are between 0.0 and 2.0.luminance_only- Sharpen only luminance channel. Values can betrueorfalse.
http://localhost:8888/unsafe/filters:sharpen(2,1.0,true)/http://videoprocessing.ucsd.edu/~stanleychan/research/pix/Blurred_foreman_0005.png
http://localhost:8888/unsafe/filters:sharpen(1.5,0.5,true)/http://images.cambridgeincolour.com/tutorials/sharpening_eagle2-original.jpg
