The process which increases the size, or number of pixels used to represent an image by interpolating between existing pixels to create the same image on a larger format. There is no implied change of vertical scan rate. Despite its name, the process does not increase the resolution of the image; it just spreads the same over a larger canvas. The quality of the result depends on that of the original image as well as the accuracy of the interpolation process that creates the new larger image. Speed is an issue for realtime work, as good quality requires a large amount of processing, which also increases with the picture area.