Convert JPEG to PGM

JPEG, short for Joint Photographic Experts Group, is a widely-used image file format for compressing digital photographs. Established in 1992 by the Joint Photographic Experts Group, it revolutionized digital imagery by providing efficient, lossy compression that maintains significant image quality. Primarily used in digital cameras, web graphics, and image sharing, JPEG files support full-color imaging with 24-bit depth, enabling detailed and high-quality photographs in relatively small file sizes.

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.