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样本数量：100张(1MB～2.6MB)旅游照 |
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样本大小：157MB |
156.44 |
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样本尺寸：3M(2048*1536) |
3145728 |
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分辨率值：72dpi |
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位每像素：5.2083 |
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位深度值：24 |
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色彩标准：sRGB |
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统一要求：保留EXIF信息（删除可减小约20KB） |
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比对工具：Beyond Compare V3.3.4.14431 |
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比对方法：比对每种配置压缩产生的“重要差异像素”数量，越小越好！ |
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容差阀值：使用PS另存为品质最佳12的JPEG格式，与原图对比，当容差为N时刚好不出现“重要差异像素”。 |
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Image OptimizerPro V5.10 6010 |
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JPEG质量 |
1% |
1% |
1% |
90% |
80% |
70% |
60% |
50% |
100% |
90% |
80% |
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魔法压缩 |
0% |
50% |
100% |
0% |
0% |
0% |
0% |
0% |
50% |
50% |
50% |
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从文件读取质量 |
✔ |
✔ |
✔ |
✘ |
✘ |
✘ |
✘ |
✘ |
✘ |
✘ |
✘ |
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压缩后大小（MB） |
138.98 |
67.16 |
53.25 |
57.68 |
36.42 |
27.92 |
22.75 |
19.81 |
90.49 |
31.34 |
22.75 |
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减小（百分比） |
11.16% |
57.07% |
65.96% |
63.13% |
76.72% |
82.15% |
85.46% |
87.34% |
42.16% |
79.97% |
85.46% |
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CIMG0027：容差14 |
1,657 |
18,287 |
47,960 |
31,028 |
96,306 |
156,854 |
217,155 |
272,750 |
1,304 |
162,805 |
265,269 |
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CIMG0024：容差15 |
73 |
675 |
1,463 |
1,150 |
2,972 |
4,939 |
7,526 |
10,360 |
90 |
4,644 |
8,605 |
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CIMG9979：容差14 |
61 |
698 |
1,592 |
1,566 |
5,045 |
8,859 |
13,620 |
18,690 |
74 |
6,178 |
12,581 |
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总差异像素 |
1,791 |
19,660 |
51,015 |
33,744 |
104,323 |
170,652 |
238,301 |
301,800 |
1,468 |
173,627 |
286,455 |
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差异（百分比扩大45倍） |
0.8540% |
9.3746% |
24.3258% |
16.0904% |
49.7451% |
81.3732% |
113.6308% |
143.9095% |
0.7000% |
82.7918% |
136.5924% |
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参考权值（越大越好） |
10.31% |
47.69% |
41.64% |
47.04% |
26.98% |
0.78% |
-28.18% |
-56.57% |
41.46% |
-2.82% |
-51.14% |
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光影魔术手 V3.1.2.103 |
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JPEG质量 |
90% |
90% |
80% |
80% |
70% |
70% |
60% |
60% |
50% |
50% |
75% |
78% |
79% |
81% |
82% |
83% |
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高质量输出 |
✔ |
✘ |
✔ |
✘ |
✔ |
✘ |
✔ |
✘ |
✔ |
✘ |
✔ |
✔ |
✔ |
✔ |
✔ |
✔ |
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压缩后大小（MB） |
65.98 |
55.97 |
41.21 |
35.79 |
32.74 |
28.08 |
27.65 |
23.46 |
24.60 |
20.70 |
36.01 |
39.45 |
40.23 |
43.31 |
44.30 |
46.55 |
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减小（百分比） |
57.83% |
64.22% |
73.66% |
77.12% |
79.07% |
82.05% |
82.32% |
85.00% |
84.28% |
86.77% |
76.98% |
74.78% |
74.29% |
72.31% |
71.68% |
70.24% |
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CIMG0027：容差14 |
2,751 |
30,819 |
21,674 |
96,037 |
47,797 |
157,168 |
76,995 |
216,996 |
110,145 |
271,171 |
35,042 |
26,506 |
24,396 |
19,088 |
17,105 |
14,692 |
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CIMG0024：容差15 |
126 |
1,203 |
779 |
3,151 |
1,592 |
5,052 |
2,770 |
7,688 |
4,352 |
10,518 |
1,217 |
891 |
849 |
651 |
567 |
496 |
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CIMG9979：容差14 |
269 |
1,640 |
1,517 |
5,203 |
3,417 |
9,029 |
5,871 |
13,909 |
8,786 |
18,989 |
2,523 |
1,889 |
1,774 |
1,436 |
1,294 |
1,150 |
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总差异像素 |
3,146 |
33,662 |
23,970 |
104,391 |
52,806 |
171,249 |
85,636 |
238,593 |
123,283 |
300,678 |
38,782 |
29,286 |
27,019 |
21,175 |
18,966 |
16,338 |
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差异（百分比扩大45倍） |
1.5001% |
16.0513% |
11.4298% |
49.7775% |
25.1799% |
81.6579% |
40.8344% |
113.7700% |
58.7859% |
143.3744% |
18.4927% |
13.9647% |
12.8837% |
10.0970% |
9.0437% |
7.7906% |
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参考权值（越大越好） |
56.32% |
48.17% |
62.23% |
27.35% |
53.89% |
0.39% |
41.49% |
-28.77% |
25.49% |
-56.61% |
58.49% |
60.82% |
61.40% |
62.22% |
62.64% |
62.45% |
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如果相同配置压缩同一组照片，压缩出来的照片MD5不一样，即存在压缩噪点。经过测试，不会出现这种情况。比对不同软件压缩质量时，不用考虑压缩噪点问题。 |
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结论：使用光影魔术手的80～85%高质量输出的压缩配置是当前最优选择。
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By:AsionTang |
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DT:2013年6月16日 21:31:36 |
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