anchor.diff:      #(99 99 99 99 99 99 99 99)
       #(99 99 99 99 99 99 99 99)))
   
  -(defconstant +q-luminance-hi+
  +(define-constant +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)
  
positive.code:     #(31 40 49 54 64 76 75 63)
      #(45 58 59 61 70 62 64 62)))
  
  (defconstant +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)
  
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)
  