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Old 05-07-2008   #3 (permalink)
John Inzer


 
 

Re: Jpeg compression

Troy Barnes (MSFT) wrote:
Quote:

> Wow, that is not the expected behavior. Can you tell me the steps I
> need to follow to reproduce the same behavior? I have an 8mpx photo.
> What kind of editing to you do to the photo? Remove red eye? Adjust
> Color? Also, do you have an original 7mpx photo where you see this
> problem that you can share with me?
==============================
Apparently the compression algorithms
used in various brands of digital cameras
are not all the same. I downloaded a few
sample JPEGs from Steve's Digicams
and used Auto Adjust on each one in
WLPG.

I found the results to be interesting:
(all from 7MP cameras 3072 x 2304)

Canon before : 3.05 MB after : 1.52 MB
Fuji before : 3.19 MB after : 2.05 MB
Kodak before : 2.14 MB after : 1.49 MB
Olympus before : 3.32 MB after : 1.51 MB
Sony before : 2.95 MB after : 1.07 MB

If you use the Revert option to undo the edit...
the original file size is also restored.

--

John Inzer
Digital Media MVP

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