By understanding how to inspect, debug, and repair these font references using tools like Acrobat, Ghostscript, and Mupdf, you can solve text rendering issues, avoid prepress disasters, and ensure your PDFs are robust for archiving and printing.
Introduction If you have ever peeked under the hood of a PDF file—using a text editor, a preflight tool, or a font inspection utility—you might have stumbled upon cryptic labels like CID Font F1 , F2 , F3 , or F4 . To the uninitiated, these look like error codes or placeholder names. However, to prepress technicians, software developers, and document engineers, these identifiers are gateways to understanding how complex scripts (especially Asian languages like Chinese, Japanese, and Korean) are handled in digital typography. cid font f1 f2 f3 f4
8 0 obj << /Type /Font /Subtype /CIDFontType2 /BaseFont /MS-Gothic /CIDSystemInfo << /Registry (Adobe) /Ordering (Japan1) /Supplement 5 >> /FontDescriptor 9 0 R /DW 1000 >> endobj 10 0 obj << /Type /Font /Subtype /Type0 /BaseFont /MS-Gothic-H /Encoding /Identity-H /DescendantFonts [8 0 R] /ToUnicode 11 0 R >> endobj By understanding how to inspect, debug, and repair
Manually repair the PDF object using a binary-safe PDF editor or re-save from the original application. 4.3 "F3 uses Identity-H encoding but no ToUnicode CMap" Effect: Copy-pasting text from that font yields garbage characters. to prepress technicians