"Smoothy" <bigvahid.antispam@hotmail.com> wrote in message news:nIJDa.7933$VS5.649589@news20.bellglobal.com...
> Hey Tesselator,
>
> Thanks for your reply.
> CP2100 has only two levels of compression at 1600*1200, which are Fine (1:4)
> and
> Normal (1:8).
> And yes, I took all of them at "Normal" setting.
>
> About the building, now I understand.
> I think I expected a little too much of my camera!    ;)
> The bright sky at the top, sun behind the building, and...
> > as if people were going not comming
> Is it a movie or a still picture?!
> JK! You're right, and it was sunset, a cloudy sunset to be more specific.
>
> Now if you don't mind, I can't understand something about these compressin
> ratios:
> The camera manual says that "Fine" is a 4:1 compression, well.
> But what this number has to do with the compression ratio I see in the image
> properties?
> Numbers like 15.7, 9.8, 10.0, ...
> The least compression I could get from my camera (1600*1200, Fine) was 7.4.
> But even with the quality set to Fine, different pictures taken with the
> camera, have different
> compression ratios shown in my image viewing software; something between 7.4
> and 10.0.
> What's the reason for this?
>
>


I don't know really...  Maybe someone who does will answer up.  Maybe that
number is the multiple of the ammount of total files size reduction or
something.  So in that one case it's 15.7 times smaller than if uncompressed.

Let's see: Uncompressed Building.jpg would be 1600x1200x3=5760000 (Bytes)
but in Jpeg it's 365912 (bytes).  Let's try:  365912x15.7=5744818

Yup, close enough.  I bet that's it.   This would be different from the
"Quality" setting we're used to using in Photoshop and others.