Convert PT3 to CID

PostScript Type 3 (PT3) is a file format developed by Adobe Systems in the 1980s for font files in PostScript language. Unlike the more common PostScript Type 1 format, PT3 allows for the inclusion of complex graphics and color. However, it is less widely used due to its lack of support for hinting, which affects the clarity of text at small sizes. PT3 was largely replaced by Type 1 fonts and later OpenType formats. It served as an important step in the evolution of digital typography, allowing greater flexibility and creativity in font design.

The CID (Character Identifier) file extension, developed by Adobe, is used for CID-keyed fonts, which are composite (multibyte) Type 1 fonts designed to support large character sets, particularly for East Asian languages like Chinese, Japanese, and Korean. These fonts address glyphs by number rather than name, allowing for efficient handling of extensive character sets. Introduced to meet the demands of the Far East markets, CID fonts facilitate high-quality digital typesetting and printing by leveraging the PostScript language.