-Figure \ref{rasterising-line} c) shows an (idealised) antialiased rendering of the line. The pixel intensity has been set to the average of the line and background colours over that pixel. Such an ideal implementation would be impractically computationally expensive on real devices\cite{elias2000graphics}. In 1991 Wu introduced an algorithm for drawing anti-aliased lines which, while equivelant in results to existing algorithms by Fujimoto and Iwata, set the state of the art in performance\cite{wu1991anefficient}\footnote{Techniques for anti-aliasing primitives other than straight lines, including the anti-aliasing of images in a raster format shown at different scales (such as Figure \ref{}) are discussed in some detail in Chapter 4 of ``Computer Graphics'' \cite{computergraphics2}}.
+Figure \ref{rasterising-line} c) shows an (idealised) antialiased rendering of the line. The pixel intensity has been set to the average of the line and background colours over that pixel. Such an ideal implementation would be impractically computationally expensive on real devices\cite{elias2000graphics}. In 1991 Wu introduced an algorithm for drawing anti-aliased lines which, while equivelant in results to existing algorithms by Fujimoto and Iwata, set the state of the art in performance\cite{wu1991anefficient}\footnote{Techniques for anti-aliasing primitives other than straight lines are discussed in some detail in Chapter 4 of ``Computer Graphics'' \cite{computergraphics2}}.