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Week 4 Nelia's Assignments


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Web Center - JPEG Optimization


Here are some examples of JPEG compression that show how much you can compress various images before losing graphics quality. This first photo is one I took in Santa Cruz, looking north up the coast.

The original file size is 270 KB.

Opt 2
Opt 3
Compression = 15, file size = 36 KB
Looks OK for most uses.
Compression = 30, file size = 26 KB
Even smaller and not much difference in appearance.
Opt 4
Opt 5
Compression = 60, file size = 17 KB
The image is beginning to degrade.
Compression = 80, file size = 26 KB
Ugly! JPEG artifacts very prominent.

Another of my photos - this one was taken looking south toward the light house.
The original photo was 276 KB.

Opt 6
Opt 7
Compression = 15, file size = 24 KB
Looks OK for most uses.
Compression = 30, file size = 17 KB
Smaller still, but the image doesn't look very good.
Opt 8
Opt 9
Compression = 60, file size = 10 KB
Yuck! This isn't really usable.
Compression = 80, file size = 7 KB
JPEG artifacts even more prominent.



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