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In order to compare results from a range of pictures the window size will not be reported in pixels, but as the number of windows along the longest side of the image. For example, if a picture is 640 $\times$ 480 pixels and the \textsc{skv} is calculated with a window size of 64 pixels then this will be written as \textsc{skv}$_{10}$ as there are 10 windows along the longest side.  For colour pictures each pixel is defined by its coordinates $i$ and $j$ and three values $k_R$, $k_G$, $k_B$ representing the colour of the pixel. In the results for colour pictures it will be made clear if the method applies has been applied  to one or more, or some combination of the RGB values. \subsection{Images}