: These usually correspond to other variations like Italic , Bold Italic , or secondary typefaces used in the document. Technical Overview
: CID (Character ID) fonts are a type of font used in PostScript and PDF documents. They are designed to efficiently handle large character sets, such as those for Asian languages, by mapping character IDs to glyph indices. CID fonts are crucial in typesetting for languages with large numbers of characters. cid font f1 f2 f3 f4
To peek inside the PDF structure:
The separation of duties among F1, F2, F3, and F4 confers immense advantages: (reusing common glyph parts), compactness (no need to store every CJK character as a unique, atomic glyph), extensibility (adding a new character collection only requires a new CMap, not a new glyph set), and flexibility (switching between horizontal and vertical writing or regional variants becomes a matter of changing the F4 context, not the entire font). : These usually correspond to other variations like