+
+Some examples of the use of curves to demonstrate the variety of possible interventions (figure~\ref{fig:ex-bezier}):
+
+\begin{itemize}
+ \item Scale the image values by increasing the white point or decreasing the white point (gain up and gain down).
+ You can decide the scaling value with the formula: $(Input \div Output) = Scale Factor$
+ \item Limit a value beyond a certain point of brightness (clamp to the value $0.587$ in the figure).
+ \item S-shaped curve to increase contrast without changing the black and white point (i.e. without \textit{clipping}).
+ \item Make a real \textit{Luma Key} by bringing a certain value of gray to $100\%$ (white) and lowering everything else to $0\%$ (black). The slope of the two sides indicates how much we want to fade the edges of the matte obtained.
+\end{itemize}
+
+