ne) of that first image until all the pixels have been processed, after which this single new image replaces the list of images in the current image sequence.  As such, in the previous example the updated version of <samp>alpha.png</samp> replaces both of the original images, <samp>alpha.png</samp> and <samp>beta.png</samp>, before being saved as <samp>gamma.png</samp>.</p>

<p>The current image <samp>s</samp> is set to the first image in the sequence (<samp>u</samp>), and <samp>t</samp> to its index, 0.  T