It seems you're asking for a review or explanation of CID fonts (Character ID fonts), specifically looking into variants labeled F1, F2, F3, F4, F5, F6 — possibly in the context of PostScript, PDF, or printer firmware (like Canon, Ricoh, or HP’s implementation of CID-keyed fonts).
However, in many Adobe applications (specifically older versions of Acrobat Distiller, Illustrator, and InDesign), the tagging algorithm devolves into a predictable sequence when fonts are renamed during synthetic generation or font substitution. cidfont f1 f2 f3 f4 f5 f6 full
This system allows a single PDF to carry a CIDFont of type F1, and any printer or viewer with that same collection can correctly render the text, even if the exact font name differs (e.g., "Kozuka Gothic" vs. "Source Han Sans"). It seems you're asking for a review or
VDP systems (like XMPie or FusionPro) dynamically generate text fields. To ensure fast rendering, they create up to six cached CIDFont subsets. Each time a new character enters the data stream, it is allocated to one of the six slots. CidFont F1 typically maps to Heisei Kaku Gothic
If you're the one making the PDFs, ensure you always select the "Embed all fonts"
The text you provided, "cidfont f1 f2 f3 f4 f5 f6 full," typically part of a technical error message or log entry related to missing or incorrectly embedded fonts in PDF documents What This Message Means Font Subsetting: