Convert XBM to G3

The XBM (X11 Bitmap Graphic) file extension is a plain-text binary file format historically used in the X Window System to store monochrome bitmap images. Its primary use is for defining small, simple graphics such as icons and cursors. Originating from the 1980s, XBM files enable the inclusion of image data directly in C source code, facilitating easy integration and compilation within applications. While their use has declined with the advent of more advanced graphics formats, XBMs remain relevant for legacy systems and specific low-resource environments.

The G3 file extension refers to the CCITT Group 3 Fax Image, a standardized format developed by the Consultative Committee for International Telegraphy and Telephony (CCITT), now known as ITU-T. This format was created to efficiently compress black-and-white fax documents for transmission over telephone lines. It employs a method called Modified Huffman Coding for data compression, enabling reduced transmission time and bandwidth usage. G3 was widely adopted in the 1980s and 1990s as the primary standard for fax transmissions, ensuring compatibility across different fax machines and systems.