Convert SFD to OTB FONT

The SFD (Spline Font Database) file extension is primarily used by FontForge, a font editing software. SFD files are ASCII-based, making them human-readable and easily transferable across the internet. They store comprehensive font data, including outlines, character data, and bitmap fonts. Introduced by FontForge, SFD files have evolved to support multiple layers and complex font features. This format facilitates detailed font design and editing, ensuring compatibility across various operating systems.

The OTB file extension, standing for "OpenType Bitmap", is a specialized format used in X11 for bitmap-only font files. It is a variant of the SFNT (scalable font) file format, tailored to store bitmap representations of fonts without vector outlines. Historically, OTB was developed to support the efficient rendering of fonts on systems with limited resources, ensuring the high-quality display of text. This format is particularly useful in environments where rendering performance is critical, such as older display systems or embedded systems.