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Quality Parameter of Picture JPG/JPEG Files
What is the quality parameter of pictures saved in JPG/JPEG format files?
✍: FYIcenter.com
Since JPG algorithm uses a lossy compression algorithm to reduce the file size, a percentage parameter, also called JPG quality, is introduced to control how picture quality should be maintained in the compression process.
For example, if JPG quality is set to 100%, then no compression should be applied to maintain the original quality (the best quality) of the picture. Of course, 100% quality will result the largest file size.
If JPG quality is set to 0%, then maximum compression should be applied which will result the worst quality loss, but the smallest file size.
Here is table of a single picture saved with different JPG qualities and their file sizes in bytes. The original picture size is 1233x1233 pixels:
Quality Size Saving 10.00% 37692 94.74% 20.00% 52510 92.68% 30.00% 64510 91.00% 40.00% 75039 89.53% 50.00% 85690 88.05% 60.00% 97051 86.46% 70.00% 114526 84.03% 80.00% 145561 79.70% 85.00% 172326 75.97% 90.00% 216516 69.80% 95.00% 317914 55.66% 100.00% 717012 0.00%
As you can see from the above table, a slight loss of quality from 100% to 95% gives a large saving, 55.66%, in file size from 717012 bytes to 317914 bytes.
2013-11-01, 2621🔥, 0💬
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