Designers producing materials for the screen, such as web graphics, have different concerns. At small sized, the area into which a letterform is to be rasterized may contain only a few pixels. Using anti-aliasing (see page 187, top right), affair impression can be given of the shape, but the character will be fuzzy, and text set this way is hard to read. Bitmapped fonts, designed for on-screen use at a fixed size, are a better choice when text is set as a graphic at small sizes (this is also why operating systems have an option to anti-alias the fonts used for labels and buttons only above a certain size). For headings and other large text, an outline font rendered with anti-aliasing is ideal.