F3 marks the transition from utility to humanity. With a medium weight, rounded terminals, and a slightly larger aperture on letters like ‘c’ and ‘e’, F3 is designed for long-form reading: novels, long articles, personal correspondence. It balances warmth with neutrality—neither formal nor casual. Serifs (if included) are soft brackets; sans-serif versions of F3 use a near-uniform stroke width to reduce eye fatigue. F3 asks nothing of the reader except to sink into the narrative. It is the voice of a trusted friend telling a story.
The Cidfont-f1 series represents a modular, function-first font encoding system, commonly encountered in embedded displays, industrial control panels, legacy terminal emulators, and certain aerospace or automotive HMIs (Human-Machine Interfaces). Unlike traditional typeface families (e.g., Helvetica, Times), the Cidfont-f1 labels (F2 through F6) denote specific rendering behaviors, glyph sets, and spacing logic rather than stylistic variations.
The naming convention (Cidfont-f...) is a remnant of PostScript 3 architecture. When an Adobe PDF Distiller processes a document, it creates a font dictionary. To save space and processing power, it assigns short handles to these dictionaries:
If you were to open a raw PDF file in a text editor, you would see these "Fx" tags used to call the font throughout the content stream. The subject string essentially summarizes the font inventory of a specific document or resource pool. Cidfont-f1 F2 F3 F4 F5 F6
Let us assume you truly have six files named Cidfont-f1.ps, Cidfont-f2.ps, etc. These are likely PostScript Type 9 (CIDFontType 0) files. Here is what each file contains:
| Component | Description |
| :--- | :--- |
| CIDFont dictionary | Contains CIDFontName, CIDFontVersion, CIDSystemInfo (which tells you the language: Japanese, Chinese, Korean). |
| FDArray | Font Descriptor Array, containing multiple sub-fonts (for different stroke weights or character sets). |
| Glyph metrics | W (widths) and DW (default width) arrays. |
| CharStrings | The actual bezier curve data for each CID (up to 65k glyphs). |
If the F1-F6 labels map to different CMaps, then: F3 marks the transition from utility to humanity
Many PDF viewers, ghostscript interpreters, and legacy RIPs (e.g., Harlequin RIP) maintain an internal fallback table when a requested font is unavailable. This table often lists generic CID fonts as:
Evidence: In Ghostscript's lib/cidfmap file, you can create custom substitutions. If the substitution points to a missing native font, Ghostscript generates a dummy internal font named Cidfont-fN.
Even in 2025, CID-keyed fonts remain critical for: If you were to open a raw PDF
If you work in prepress or PDF engineering, seeing Cidfont-f4 in a preflight report is a red flag. It means fonts are not embedded and output will be inconsistent across different printers.
Rating: ★★★☆☆ (3.5/5 – Functional but niche)