Every PostScript typeface is made up of three parts: The printer file, the screen fonts, or bitmap fonts, and the Adobe Font Metrics file.
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The printer file is the actual PostScript code used to print all the characters in a typeface. Its icon is a LaserWriter NTX with the letter ‘F’ in a box (shown at left).
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The screen fonts, are the bitmap representations of the actual PostScript typefaces. They are used to select the desired font and to show approximately how it will appear on the printed page.
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NOTE: Before PostScript took over the typesetting industry, the words
“typeface” and “font” referred to two different things. The typeface referred to a specific style of type, such as Avant Garde, or Optima. Font referred to a specific type size, such as Helvetica 12 point. Since type point sizes are not specific to PostScript type styles, the words font and typeface are now used interchangeably.