NEW VERSION now with option for split preview
Gmic -Contrast Swiss Mask by
PhotoComiX, on Flickr
A very simple filter with not too much options or controls
..but maybe the first complete digital application of
Contrast Mask ,as was used in Darkroom
....weird that all other
Contrast Mask filters are limited to only lower the
contrast, should be obvious that the same principle used to locally lower the
contrast , may be well used also to locally increase the
contrast.
Obviously a
Contrast Mask is a a very simple way to manipolate the
contrast but Smay be very effective
As default works as a
Contrast Mask:
if the original is
DSC00138-S.jpg by
{ pranav }, on Flickr
Then the result would be
Gmic -Contrast Swiss Mask by
PhotoComiX, on Flickr
But the same
mask could be used to get the opposite effect
If you check the SKIP button ...then the effect will be the opposite of a traditional
Contrast MaskWHAT SKIP DOESORIGINALUntitled by
jared, on Flickr
Default -
NO "skip " option checked
Contrast Swiss Mask - NO skip by
PhotoComiX, on Flickr
SKIP enabledContrast Swiss Mask -Skip by
PhotoComiX, on Flickr
ORIGINALNuclear Winter in Chernobyl by
Stuck in Customs, on Flickr
SKIP enabled
Contrast Swiss Mask -Skip by
PhotoComiX, on Flickr
#########HERE#THE#FILTER###############################
#@gimp
Contrast Swiss Mask : gimp_contrast_swm2 , gimp_contrast_swm2_preview(0)
#@gimp : sep = separator ()
#@gimp : Blur the
mask = float(2,0.5,10)
#@gimp : sep = separator ()
#@gimp : note = note ("
Contrast Mask need the negative of the
mask")
#@gimp : SKIP to use the
mask to boost = bool(false)
#@gimp : note = note ("Uncheck for
Contrast Mask,Check for
Contrast Boost")
#@gimp : sep = separator ()
#@gimp : note = note("Merge the
Mask")
#@gimp : Intensity = float (1,0,1)
#@gimp : sep = separator ()
#@gimp : Preview type = choice("Full","Forward horizontal","Forward vertical","Backward horizontal","Backward vertical")
#@gimp : sep = separator(), note = note("<small>Author : <i>PhotoComiX</i>. Last update : <i>2010/12/26</i>.</small>")
#@gimp : note = link("Filter explained here","http://www.gimpchat.com/viewtopic.php?f=9&t=864")
gimp_contrast_swm2 :
-repeat @# -l[$>] -split_opacity -l[0]
--luminance -to_rgb
-blur_xy[1] $1,$1
-if {$2==0} -negative[1] -elif {$2==1} -gimp_do_nothing -endif
-reverse[-2,-1] -gimp_compose_hardlight[-2,-1] $3
-endl -a c -endl -done
gimp_contrast_swm2_preview :
-gimp_split_preview "-gimp_contrast_swm2 ${1--2}",$-1
###########END#############
#################################################
Here the ControlsGMIC - Contrat Swiss Mask-updated by
PhotoComiX, on Flickr
The first slider control the blurring of the
mask,
default is a good starting point you may raise for large or very large images
Note well the Skip option allow to use the
mask for the opposite effect, see below
Last slider control the intensity of the Effect,
More exactly allow to fade the effect over the original
( with Intensity 0 would be no any change )
ORIGINALContrast swiss mask test - ORIGINAL by
PhotoComiX, on Flickr
"SKIP" box checked (boost, opposite effect )Contrast swiss mask test -boost by
PhotoComiX, on Flickr
THE DEAFULT (mask)Contrast swiss mask test - mask by
PhotoComiX, on Flickr
Normally the
contrast mask is used to locally decrease
contrast to recover details in overcontrasted zones
Here the details on the right side (inside the blue box and on that side of the wall ) are burned or washed away beyond hope, so the effect of the the default setting are mainly visible on the lef side were is more to recover
ORIGINALChristmas Beer by
thskyt, on Flickr
DEFAULTContrast swiss mask test - mask by
PhotoComiX, on Flickr
LAST CONTROL is for the type of preview, as default is normal but you may get a horizontal or verical split preview , showing the before after as here
Gmic -Contrast Swiss Mask by
PhotoComiX, on Flickr