Convert PGM to ISOBRL6

The Portable Graymap (PGM) file extension, originating in the late 1980s as part of the Netpbm project, stands for "Portable Gray Map". It serves as a simple, versatile format for grayscale images, enabling easy reading and writing by various programs. Due to its straightforward structure and plain text encoding, it's often used in academic and research settings where ease of parsing and accessibility are crucial. PGM files store grayscale images in a compact, efficient manner, making them an essential tool for image processing tasks.

The ISOBRL6 file extension, short for ISO/TR 11548-1 Braille 6 dots, is a digital format used to store and represent Braille characters and documents. It is an enhanced version of the original ISOBRL format, offering improved features for displaying textual and symbolic information in Braille. This format supports a wide range of Braille codes, character sets, and languages, making it suitable for Braille printing, displays, and electronic readers for visually impaired individuals. The ISOBRL6 format adheres to the international standard ISO/IEC 14496-28, ensuring compact and portable representation of Braille text for electronic systems.