| Identifier | Typical Meaning | Use Case | | :--- | :--- | :--- | | | Generic/synthetic fallback | Placeholder for missing CJK fonts | | HeiseiKakuGo-W5 | Specific Japanese font | Professional East Asian typesetting | | Ryumin-Light | Specific Japanese serif | Traditional publishing | | Identity-H | CMap (not a font) | Unicode mapping | | C0_0 | Subset of embedded font | Web-optimized PDFs |
The computer knows how to render the shapes visually, but it has no idea what actual letters or semantic meanings those shapes represent. 2. Missing Font Substitutions cid font f1 family
So generally means: In the current document, the CID-keyed font labeled F1 belongs to a particular font family (e.g., Heisei Mincho, Kozuka Gothic, SimSun, etc.). | Identifier | Typical Meaning | Use Case
CIDFont+F1 font family is not a standard typeface designed for aesthetic choice but is instead a technical placeholder name CIDFont+F1 font family is not a standard typeface
When software generates a PDF, it compresses and optimizes the embedded fonts. To keep the file size minimal, it may subset the font (including only the characters used) and rename the internal font structure to an abbreviated label like F1 , F2 , or TT1 .
When a PDF uses Identity encoding, it tells the PDF viewer to map the character codes directly to the CID numbers without any intermediate conversion. This ensures the document looks identical across all operating systems. Common Issues Associated with CID Font F1
/F1Family << /Type /Font /Subtype /Type0 /BaseFont /F1Family /Encoding /UniCNS-UTF16-H /DescendantFonts [ /CIDFont_F1 ] >>