Tech.Luver writes: "The multiple countries participating in the Joint Photographic Experts Group, which created the JPEG standard, have approved an effort to make Microsoft's HD Photo format a standard called JPEG XR, said Bill Crow, who has led Microsoft's HD Photo effort and who just took over the company's Microsoft Live Labs Seadragon imaging project. XR stands for "extended range," a reference to the format's ability to show a wider and finer range of tonal gradations and a richer color palette.
( http://techluver.com/2007/11/02/microsofts-hd-photo-gets-nod-from-jpeg-to-become-jpeg-xr/ )"
egrep patterns are full regular expressions; it uses a fast deterministic
algorithm that sometimes needs exponential space.
-- unix manuals