Explain why using Q10 gives a better compression ratio but a poorer image quality than using Q90 (see Figure 28.18).

Figure 28.18

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Figure 28.18 Three different quantization matrices 80 60 50 80 120 200 255 255 55 60 70 95 130 255 255 255 70 65 80 120 200 255 255 255 70 85 110 145 255 255 255 255 16 11 10 16 24 40 51 61 2 3 5 8 10 12 12 12 14 19 26 58 60 55 12 12 11 11 14 11 2 2 3. 14 13 16 24 40 57 69 56 3 3 3 5 8 14 17 22 29 51 87 80 62 3 3 4 10 17 16 12 11 14 22 21 15 5 7 11 13 16 12 23 18 90 110 185 255 255 255 255 255 18 22 37 56 68 109 103 77 4 4 7 120 175 255 255 255 255 255 255 245 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 24 35 55 64 81 104 113 92 49 64 78 87 103 121 120 101 10 13 16 17 21 24 24 21 72 92 95 98 112 110 103 99 14 18 19 20 22 20 20 20 Q10 Q50 Q90 3.