anchor.diff:  (defconstant +M_APP0+ #xe0)
   
   ;;; Default quantization tables
  -(defconstant +q-luminance+
  +(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)
  
positive.code:     #(99 99 99 99 99 99 99 99)
      #(99 99 99 99 99 99 99 99)))
  
  (defconstant +q-luminance-hi+
    #(#(10 7 6 10 15 25 32 38)
      #(8 8 9 12 16 36 38 34)
      #(9 8 10 15 25 36 43 35)
  
negative.code:     #(49 64 78 87 103 121 120 101)
      #(72 92 95 98 112 100 103 99)))
  
  (define-constant +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)
  