Sharpen

Usage: sharpen(sharpen_amount,sharpen_radius,luminance_only)

Description

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.

Arguments

• 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 be ‘true’ or ‘false’

Example 1

http://localhost:8888/unsafe/filters:sharpen(2,1.0,true)/http://videoprocessing.ucsd.edu/~stanleychan/research/pix/Blurred_foreman_0005.png

Example 2

http://localhost:8888/unsafe/filters:sharpen(1.5,0.5,true)/http://images.cambridgeincolour.com/tutorials/sharpening_eagle2-original.jpg