+\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 (viewports).
+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 \texttt{Match $\rightarrow$ Match project size}. When you \emph{Match project size}, you
+are conforming the output to the asset. To change the size and aspect ratio of the output (Projector) we have to change the whole project, which will alter all the tracks in the timeline. 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.
+