TMG-L Archives

Archiver > TMG > 2008-07 > 1217276852


From: "Elroy Davis" <>
Subject: Re: [TMG] OT saving digital images TIFF vs JPEG
Date: Mon, 28 Jul 2008 16:27:32 -0400
References: <005b01c8f0d3$4ea94160$0301a8c0@BJLaptop>
In-Reply-To: <005b01c8f0d3$4ea94160$0301a8c0@BJLaptop>


The issue with JPEGs is what happens when you edit them. The JPEG format is
a compressed format, which means that each time it is saved, the computer
tries to compress the image to a smaller file size by taking out information
that it doesn't think is necessary. In most cases, this isn't visible
information that you would notice.

So, if you open a JPG and edit it somehow, then save it, some information is
lost. If you do that repeatedly to the same file, eventually so much
information is lost that it becomes visible in the form of a blurred image.
Think of it like taking a photocopy of a photocopy of another photocopy.

As Darrell and Lee mentioned, if you save the file as a JPEG, an then just
use it to view the image, you won't lose anything. Generally if I find that
I need to edit an image, I make a copy of the original and work on copy.
That way I always have the information that is in the original.

-Elroy
(A native Vermonter in Vermont - There aren't many of us left ;-) )

On Mon, Jul 28, 2008 at 12:59 PM, Barbara Heard <>wrote:

> Hi TMGers,
> I have an off-topic question for you.
> A friend has recently reminded me that I should not save my digitized
> images as JPEG but should rather save them as TIFF. I remember hearing
> something about degradation of the image quality with JPEG. I have tried
> to
> find information on this topic on the internet but so far have not found
> enough information to satisfy my curiosity.
> Do any of you know of a reliable place I can go to read about this
> issue?
> Thank You
> Barbara Heard
>
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