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.

The compressed JBIG2 file size can differ dramatically between different JBIG2 encoders. For example, consider the original file sigice9_172.tif. The jb2-pdf filecreated 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 datasets are given here below. As shown, the CVision encoded files are generally 35% - 40% smaller.

Figure 5. Across three very different sets of images, the CVision compressed files are significantly smaller than those of the competition.

Even within lossless compression there can be a big difference in file size. Here is a comparative sample of a typical patent file in which the size of a lossless CVision compressed file is less than a third of the size of a competing vendor's lossless file.