NAME
selective_sharpen - Sharpen edges in controlled fashion
SYNOPSIS
<Image>/Filters/Enhance/Selective Sharpen...
DESCRIPTION
Taken from an IRC log:
02:00 <@ tigert> selective sharpening
02:00 <@ tigert> UnNamed: 1) take the original photo, duplicate the
layer
02:01 <@ tigert> UnNamed: 2) convert the copy to grayscale
02:01 <@ tigert> 3) run edge detect to the gray layer
02:01 <@ tigert> 4) blur it slightly
02:01 <@ tigert> 5) boost contrast (I can give you a specific curve or
such)
02:01 < sjburges> tigert: on 3, what edge detect?
02:01 <@ tigert> sjburges: default works
02:01 <@ tigert> sjburges: size: 3 or 2 (default)
02:02 <@ tigert> sjburges: then make the boosted, gray edge-detection
into a selection mask
02:02 <@ tigert> sjburges: then use unsharp mask to that selection
(scratch the gray layer)
02:03 <@ tigert> sjburges: sjburges now, one could do two versions
02:03 <@ tigert> sjburges: so one version could just be "Select edges"
02:04 <@ tigert> sjburges: another could ask for unsharp mask
parameters as well and sharpen
02:04 <@ tigert> sjburges: the idea for the script is to sharpen it
without sharpening the noise on flat areas
02:04 < sjburges> tigert: could you fire me an email, and I can try to
get to it tonight/tomorrow? It sounds simple enough.
I need to head to a party for work shortly here
02:04 <@ tigert> sjburges: ok
PARAMETERS
[ PF_SPINNER, "sharpen_radius", "Radius of unsharp", 5.0, [0.1,120,0.1]],
[ PF_SPINNER, "sharpen_amt", "Amount to unsharp", 1.0, [0.0,4.0,0.1]],
[ PF_SPINNER, "threshold", "What delta to decide to sharp on", 20, [0,255,1]],
IMAGE TYPES
RGB*
AUTHOR
Seth Burgess <sjburges@gimp.org>
DATE
2004/14/04
LICENSE
Copyright 2004, Seth Burgess.
This filter may be distributed under the same terms as Gimp-Perl.