1. A method of rendering text on a display screen of a computer device, the computer device including a memory storing an image file, the image file defining an image containing a plurality of glyphs, the plurality of glyphs being arranged horizontally in the image, the memory having stored thereon data regarding the order of said glyphs and width data regarding the width of each of said glyphs, the method comprising the steps of: defining a portion of said image containing one of said plurality of glyphs and excluding at least one other of said plurality of glyphs, including determining the location of said one of said plurality of glyphs within said image and the size of the portion based upon said data regarding the order and said width data; and rendering said portion on the display screen, wherein said plurality of glyphs represent a font in which said width data is not identical for each of said plurality of glyphs, and wherein said width data includes: a single stored standard width for said plurality of glyphs; and the respective stored width of each glyph of said plurality of glyphs that deviates from the standard width, and wherein at least one glyph in the image file has the standard width.