anchor.diff:      #(31 40 49 54 64 76 75 63)
       #(45 58 59 61 70 62 64 62)))
   
  -(defconstant +q-chrominance-hi+
  +(define-constant +q-chrominance-hi+
     #(#(11 11 15 29 62 62 62 62)
       #(11 13 16 41 62 62 62 62)
       #(15 16 35 62 62 62 62 62)
  
positive.code:     #(49 64 78 87 103 121 120 101)
      #(72 92 95 98 112 100 103 99)))
  
  (defconstant +q-chrominance+
    #(#(17 18 24 47 99 99 99 99)
      #(18 21 26 66 99 99 99 99)
      #(24 26 56 99 99 99 99 99)
  
negative.code: (defconstant +M_APP0+ #xe0)
  
  ;;; Default quantization tables
  (define-constant +q-luminance+
    #(#(16 11 10 16 24 40 51 61)
      #(12 12 14 19 26 58 60 55)
      #(14 13 16 24 40 57 69 56)
  