+\subsection{The Temporary, Track and Output Sizes}%
+\label{sub:track_and_output_sizes}
+
+This section explains a few things which help to understand Compositing - especially with relation
+to the camera, effects, and the projector.
+
+\subsubsection*{The Temporary}%
+\label{ssub:output_size}
+
+\CGG{}'s compositing routines use a \textit{temporary} which is a single frame of video in
+memory where graphics processing takes place. The size of the temporary and of the output in
+the compositing pipeline are different and vary for any particular frame. Effects are processed in
+the temporary and as such are affected by the temporary size. In the case of the camera, its
+viewport is the temporary size. However, projectors are rendered to the output and so are affected
+by the output size. When the temporary is smaller than the output, the temporary will have blank
+borders around the region in the output. When the temporary is larger than the output, it will be
+cropped.
+
+\subsubsection*{Track and Output size}%
+\label{ssub:track_size}
+
+The \textit{Track size} is used to define the temporary size with each track having a different size.
+You can see or set the track size by RMB click on a track and then select \emph{Resize Track} to resize
+the track to any size. Or select \emph{Match output size} to make the track the same size as the
+output. When a track is resized what it looks like on the compositor changes. The relationship
+between the track and the project's output size makes it possible to magnify or reduce the size of
+a track in regards to the final output. This feature means you cancreate visual effects such as split
+screens, zooms, and pans in the compositor.
+
+The \textit{Output size} can be set in \texttt{File $\rightarrow$ New} when creating a new project,
+or by using \texttt{Settings $\rightarrow$ Format}, or in the Resources window with RMB click on
+a video asset and choosing \emph{Match project size}. When you \emph{Match project size}, you
+are conforming the output to the asset. Once you have set the output size in 1 of these 3 ways,
+any newly created tracks will conform to the specified output size. When rendering, the project's
+output size is the final video track size where the temporary pipeline is rendered into.
+