This Recommendation International Standard defines methods for coding bi-level images and sets of images (documents consisting of multiple pages). It is particularly suitable for bi-level images consisting of text and dithered (halftone) data.
The methods defined permit lossless (bit-preserving) coding, lossy coding, and progressive coding. In progressive coding, the first image is lossy, subsequent images may be lossy or lossless.
This Recommendation International Standard also defines file formats to enclose the coded bi-level image data.