JBIG2 Technical Advantages: File Size
The file size advantage of JBIG2s over generic TIFFs is usually quite dramatic. For a typical scanned document at 300dpi, the TIFF is roughly 75 KB -125 KB bytes per image, while the JBIG2 is about 5x-10x smaller, in the range of 10 KB -15KB bytes per image.
JBIG2 File Sizes and JBIG2 Encoders
The compressed JBIG2 file size can differ dramatically between different JBIG2 encoders. For example, consider the original file sigice9_172.tif. The jb2-pdf file created by one vendor (CVISION PdfCompressor) is less than half the size of the one created by a competing vendor. Other file size comparisons between these two JBIG2 converters across several data sets are given here below. As shown, the CVISION encoded files are generally 35% - 40% smaller.