a subclass of for editing gamma curves.
This widget is considered too specialized/little-used for GTK+, and will in the future be moved to some other package. If your application needs this widget, feel free to use it, as the widget does work and is useful in some applications; it's just not of general interest. However, we are not accepting new features for the widget, and it will eventually move out of the GTK+ distribution.
The <gtk-gamma-curve> widget is a variant of <gtk-curve>
specifically for editing gamma curves, which are used in graphics applications
such as the Gimp.
The <gtk-gamma-curve> widget shows a curve which the user can edit with
the mouse just like a <gtk-curve> widget. On the right of the curve it
also displays 5 buttons, 3 of which change between the 3 curve modes (spline,
linear and free), and the other 2 set the curve to a particular gamma value, or
reset it to a straight line.