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C++ API

 [fmt, extra, i, zrange] = _g_image_cmd (sz, zrange, args, va)

 sz     = [H W] or [H W 3] image size
 zrange = [min, max]       range of greylevel/RGB values
 args     struct w/ current defaults
 va       extra options
       "range" ,  r: replace zrange
       "xrange",  r: Define region in which image is drawn
       "yrange",  r:
       "xyrange", r:
       "colormap" yesno : map greylevels to color
 
 fmt   : Gnuplot plot argument
 extra : Gnuplot pre-plot argument
 i     : Number of arguments used in va.