# Using Image-Based Font Files

If you use an .ocf file generated by the VisionPro OCV Font Editor, the 32-bit character key value for each character in the font file is defined as follows:

- The high-order 16 bits give the Unicode code point of the first character of the character position's name.
- The low-order 8 bits give the character instance number, if the font has multiple instances of the same character.
- Bits 8-15 are an arbitrary value set so that the 32-bit key value is unique within the font. Usually these bits are set to 0x00.

Note: The Character property for a character from an .ocf font will not be valid.