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Pictures - JPEG (Poorly Compressible)
Compression Rate
| Data Compressors |
Original Size (bytes) |
Compressed Size (bytes) |
Space Saved (bytes) |
SBC Archiver |
200,001,026 |
195,234,296 |
4,766,730 |
Squeez |
200,001,026 |
198,755,822 |
1,245,204 |
gzip |
200,001,026 |
199,081,273 |
919,753 |
WinZip |
200,001,026 |
199,085,643 |
915,383 |
WinRAR |
200,001,026 |
199,471,875 |
529,151 |
bzip2 |
200,001,026 |
199,486,800 |
514,226 |
7-Zip |
200,001,026 |
199,564,997 |
436,029 |
WinAce |
200,001,026 |
199,573,472 |
427,554 |
WinRK |
200,001,026 |
199,955,945 |
45,081 |
ARJ32 |
200,001,026 |
200,007,204 |
-6,178 |
StuffIt |
200,001,026 |
200,014,546 |
-13,520 |
The best compressor of this fileset was, by a very large lead, SBC Archiver. Even for this super-tough fileset, it managed to reduce the archive size by over 4.7MB or 2.4%. Very, very impressive. Even its closest contender, Squeez, could only reduce the size of the archive by 1.2MB (0.6%).
Generally, most of the compressors were abysmal at this fileset. The worst compressors this time were ARJ32 and StuffIt. This is because they did not even compress the files. They only packed the files, creating an archive that was larger than the fileset.
Compression Speed
| Data Compressors |
Original Size (bytes) |
Time (s) |
Speed (KB/s) |
StuffIt |
200,001,026
|
4.46 |
44843.3 |
ARJ32 |
200,001,026
|
5.46 |
36630.2 |
WinRAR |
200,001,026
|
13.72 |
14577.3 |
gzip |
200,001,026
|
13.80 |
14492.8 |
WinZip |
200,001,026
|
13.96 |
14326.7 |
WinRK |
200,001,026
|
24.36 |
8210.2 |
bzip2 |
200,001,026
|
48.86 |
4093.3 |
SBC Archiver |
200,001,026
|
92.61 |
2159.6 |
Squeez |
200,001,026
|
114.61 |
1745.1 |
7-Zip |
200,001,026
|
121.39 |
1647.6 |
WinAce |
200,001,026
|
196.36 |
1018.5 |
The speed leaders in this test were naturally, StuffIt and ARJ32. After all, they were only packing the files without compressing them. The fastest compressors that actually compressed the files were the trio of WinRAR, gzip and WinZip. They were all able to compress files at speeds in excess of 14MB/s.
While SBC Archiver (which produced the smallest archive ) was slow in this test, it was not the slowest. WinAce has that dubious honour. It took over 3 minutes to complete the task. That makes him more than 14x slower than WinRAR.
Compression Efficiency
The compression efficiency rating is a simple way to evaluate the efficiency of each data compressor. This way, we can see which compressor can save the most space in the least time.
Please note that a higher efficiency rating does not mean the compressor is better. It just means the compressor has a better compression-to-speed ratio. A more efficient compressor is, of course, always more desirable than a less efficient one.
The efficiency champions in this test were gzip and WinZip. They were more than 27% more efficient than their nearest contender, SBC Archiver. SBC Archiver's third position was not surprising since it had a very high compression rate, compared to the other compressors. Had it been faster, it could have usurped gzip's and WinZip's position as the most efficient compressors in this test.
WinRAR did quite well, but the other compressors were rather inefficient. The most inefficient compressors of JPEG files were ARJ32 and StuffIt. Their super-fast "compression" speed was of no help at all, because they didn't even bother to compress the files. In fact, they turned in archives that were larger than the fileset.
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