JBig2 vs JB2
From VersusWiki
JBig2 is an image compression format for black and white images that offers significant improvements of Fax Group 4 compression.
JB2 is a compression format that is based on JBig2 that is used by the DjVu file format for compressing bitonal images and masks.
.JB2 is also the extension used for JBig2 files.
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[edit] References
"...an algorithm called JB2, which is a variation of AT&T's proposal to the upcoming JBIG fax standard." - High Quality Document Image Compression with DjVu
