Open Acrobat Reader and go to > Preferences (or Ctrl + K ). Select Page Display from the left sidebar. Check the box that says "Use local fonts" . Click OK , close the PDF, and reopen it. Fix 4: Print the PDF as an Image
In the world of digital typography and document processing, few topics generate as much confusion as CID fonts and their associated naming conventions like F1, F2, F3, and F4. Whether you're a prepress technician, a PDF workflow specialist, a software developer working with document rendering, or simply someone who's encountered these mysterious identifiers in error messages or font lists, understanding CID fonts and their resource naming patterns is essential.
Unlike traditional Western fonts, which rarely exceed 256 characters, CJK languages require thousands of unique glyphs.
This separation of mapping from glyph storage creates tremendous efficiency. A single CIDFont file can serve multiple encoding systems, and multiple CIDFonts can share the same CMap resources.
These seemingly cryptic labels are actually the backbone of how complex scripts (like Chinese, Japanese, and Korean – CJK) are processed and printed. This article will demystify the naming convention, explain how it works, and show you why it matters for your workflow.
5 0 obj << /Type /Page /Parent 2 0 R /Resources << /Font << /F1 10 0 R /F2 12 0 R /F3 14 0 R /F4 16 0 R >> >> /Contents 20 0 R >> endobj
When a PDF renders the raw CID (Character Identifier) streams instead of the formatted font, the document is telling you the truth. It is stripping away the marketing, the serif, the flourish, and the societal weight of typography. It is saying:
It is the machine’s way of speaking in its native tongue. It is the moment the document stops trying to impress you and starts simply being .
Each issue requires different troubleshooting approaches.
If your PostScript printer logs an error like: "Error: CID font F1 not found" — it means the printer tried to render Japanese text but the internal ROM font for Supplement 0 of Adobe-Japan1 is missing or corrupt.
First, it is necessary to establish the foundational concept of a CID-keyed font. Unlike traditional fonts that rely on a single-byte encoding (e.g., ASCII for Latin fonts), a CID font separates the character collection from the glyph descriptions. A is a number that identifies a character, not its visual representation. A CMap (Character Map) then translates between an external encoding (like Shift-JIS or Unicode) and these internal CIDs. The "F" designators—F1 through F4—are specific data structures or processing states within the Adobe Type Manager and PostScript rendering engines that facilitate this mapping and glyph retrieval process.