WJG (22/0/09) Another GIMP legacy widget, the gnocl::gCurve is the implementation of the Gtk gamma curve editing widget used to explicitly set the contrast range of graphic image in the GIMP image manipulation program. A highly specialised widget, but has to be in the toolkit for a full set o' spanners!

And the test script...

# Author:   William J Giddings
# Date:     07/05/09
# the next line restarts using tclsh \
exec tclsh "$0" "$@"

package require Gnocl

set gCurv [gnocl::gammaCurve]

gnocl::window -child $gCurv -widthRequest 200 -heightRequest 200 -title gnocl::gcurve