page_title: Multiple master fonts
section_title: Application support
hierarchical_section_title: Multiple master fonts / Application support
caption_attribution_description: English: each typesize in a different form
context_page_description: Multiple master fonts are an extension to Adobe Systems' Type 1 PostScript fonts, now superseded by the advent of OpenType and, in particular, the introduction of OpenType Font Variations in OpenType 1.8, also called variable fonts.
  Multiple master fonts contain two or more "masters"—that is, original font styles—and enable a user to interpolate between these masters along a continuous range of "axes." With proper application support, these axes could be adjusted on demand.
  The intention was that using multiple master fonts, a designer can generate a style of the exact width, thickness and optical size wanted, without losing the integrity or readability of the character glyphs. The effect is similar to morphing, as a designer can choose an intermediate between two styles, for example generating a semibold font by compromising between a bold and regular style, or perhaps extend a trend to create an ultra-light or ultra-bold. This idea was not new, having been used by companies such as URW++, but Adobe hoped to develop the technology to a greater extent.
context_section_description: Current application support for these fonts is sparse, if not entirely absent. However, font design tools such as FontLab and FontForge can edit MM fonts, and can export into other font formats as needed. Adobe Type Manager (ATM) is required for MM support on Windows and the "Classic" Mac OS (9 and below).
  Describing why the technology failed, a retrospective by Tamye Riggs, written for Adobe, noted: "Users were forced to generate instances for each variation of a font they wanted to try, resulting in a hard drive littered with font files bearing such arcane names as MinioMM_578 BD 465 CN 11 OP." Prominent Adobe font designer Carol Twombly cited the frustrations of the failed project as one of several reasons behind her decision to leave font design around 1999, and Adobe's Christopher Slye would later relate that he had been concerned that Adobe's principal type designer Robert Slimbach had damaged his health struggling to apply multiple master technology to Adobe Jenson in the late 1990s.
caption: A set of optical sizes developed at URW++. The letters become higher in x-height and more widely spaced as the point size for which they are intended decreases.
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