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+>>>>>>> fca0231... minor adds to cha 9
Curves are generally adjusted by introducing several control points, some to be kept fixed (as anchors) to prevent curve modification beyond them, and others to be dragged to make the desired correction. The power of the curves lies in being able to circumscribe a small interval at will and intervene only on this without involving the remaining parts of the frame. The precision with which you can work is such that you can almost arrive at a secondary color correction.
\begin{figure}[htpb]
- \centering
- \includegraphics[width=0.75\linewidth]{images/ex-bezier.png}
- \caption{Gain Up/Down; clamp; S-Shaped curve and Luma Key}
- \label{fig:ex-bezier}
+ \centering
+ \includegraphics[width=0.75\linewidth]{images/ex-bezier.png}
+ \caption{Gain Up/Down; clamp; S-Shaped curve and Luma Key}
+ \label{fig:ex-bezier}
\end{figure}
The \textit{Polynomial} and \textit{Bézier} types introduce \textit{control handles} that allow for more sophisticated and smoother adjustments. The quality of the result is much better, but they require more experience for their optimal use. Extending the handles away from the control point increases the \textit{radius} of the curve at that point. By varying the angle of the handles we change the \textit{tangent} and thus the curvature of the curve below. The difference between Polynomial and Bézier lies in the underlying mathematics, but for practical purposes the use is similar.
-
Some examples of the use of curves to demonstrate the variety of possible interventions (figure~\ref{fig:ex-bezier}):
\begin{itemize}
\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}
-
\subsection{HolographicTV}%
\label{sub:holographictv}