Archived posting to the Leica Users Group, 2006/02/25

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Subject: [Leica] Daily Dose of Spring XI
From: raimo.m.korhonen at uusikaupunki.fi (Raimo K)
Date: Sat Feb 25 07:38:27 2006
References: <9b678e0602221659y6619bb2fp9176ecef4b4598ba@mail.gmail.com><43FD1511.1060904@adrenaline.com><9b678e0602221852u567a926x9a66976d75ee468e@mail.gmail.com><43FD2791.9040206@adrenaline.com><9b678e0602221916j5df65dd9t2b2a286b9f194341@mail.gmail.com><066141F2-F013-464B-934F-FA3F493B5DA9@ralgo.nl><6.2.3.4.2.20060223133203.02a83060@mail.rhtc.net><EEE0C0BF-5895-4C66-94F6-30C1260279BE@ralgo.nl><1140769617.43fec351bcddc@www.uusikaupunki.fi> <80j0025muocec36bntcv6vfrvedl7k54mb@4ax.com>

So why it is not compressed - smaller, that is - the new file can even be 
larger than the original. I know that no new information cannot be created 
but does not compressing make files smaller - that is the very idea.
All the best!
Raimo K
Personal photography homepage at:
http://www.uusikaupunki.fi/~raikorho


----- Original Message ----- 
From: "Eric" <ericm@pobox.com>
To: "Leica Users Group" <lug@leica-users.org>
Sent: Saturday, February 25, 2006 2:25 PM
Subject: Re: [Leica] Daily Dose of Spring XI


> Raimo:
>
>>If you select to save JPGs using original quality it will not be
>>compressed again - at least the programs I use do it this way.
>
> I would be careful.  All JPG compression is lossy.  That is, when you save
> the jpeg file, it throws away some information.  So the next time when you
> open the file, it doesn't have 100%.  Which is fine for saving once and
> viewing.  But if you save again, then you're tossing out more information.
> Viewing jpegs is fine.  And there are some programs that can rotate jpegs
> without losing information.  But if you save again, you will lose
> information.  If you save using the original quality, I'm guessing that
> means use the same level of compression that was first used.  If you 
> change
> an image and then save the jpeg again, it *will* be compressed again.
> That's the way jpeg works.
>
>
>
> --
> Eric
> http://canid.com/
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information 


Replies: Reply from Frank.Dernie at btinternet.com (Frank Dernie) ([Leica] Daily Dose of Spring XI)
In reply to: Message from don.dory at gmail.com (Don Dory) ([Leica] Daily Dose of Spring XI)
Message from scott at adrenaline.com (Scott McLoughlin) ([Leica] Daily Dose of Spring XI)
Message from don.dory at gmail.com (Don Dory) ([Leica] Daily Dose of Spring XI)
Message from scott at adrenaline.com (Scott McLoughlin) ([Leica] Daily Dose of Spring XI)
Message from don.dory at gmail.com (Don Dory) ([Leica] Daily Dose of Spring XI)
Message from bruce at ralgo.nl (bruce) ([Leica] Daily Dose of Spring XI)
Message from images at InfoAve.Net (Tina Manley) ([Leica] Daily Dose of Spring XI)
Message from bruce at ralgo.nl (bruce) ([Leica] Daily Dose of Spring XI)
Message from raimo.m.korhonen at uusikaupunki.fi (Raimo K) ([Leica] Daily Dose of Spring XI)
Message from ericm at pobox.com (Eric) ([Leica] Daily Dose of Spring XI)