«

On Thu, 20 Jul 2006 10:10:47 -0700, Bill Funk <>
wrote:

>On Thu, 20 Jul 2006 08:11:54 -0700, John McWilliams
><> wrote:
>
>>If you open a jpeg in a competent graphics program, and do not edit,
>>there is no re-compression, and hence no loss. Programs that do
>>otherwise are rather lacking.
>
>As was said before, it's not the editing that causes loss, it's the
>saving.
>Open and edit a Jpeg file all you want. If you don't save it, there's
>no action performed on the opened file.

Well, in fact you can even edit some informations, without any need to
re-compress the image information itself.
If you only want to changeMeta Informations like Exif, change an ICC
profile or modify Photoshop Blocks like Working Paths, a capable
program should be able to save the modified image without any
re-compression for the image data itself.

On 7/20/06 1:47 PM, Ed Ruf wrote:
> On Thu, 20 Jul 2006 12:37:13 -0700, in rec.photo.digital John
> McWilliams <> wrote:
>
>> Of course. But someone seems to think that just saving an open jpeg will
>> cause losses, which it won't with a competent image app.
>
> Open a file in PS CS2, choose Save As to another name. Guess what, it
> recompresses. Open a file in PSP7 or 8 (as the versions I have) just
> click Save. Guess what?
>
No guessing required. Save As in PS is different from Save. If one
wishes an exact copy of an image, one uses a Finder copy.

Your sig delimiter is still missing.

--
john mcwilliams

On Thu, 20 Jul 2006 14:45:32 -0700, in rec.photo.digital John McWilliams
<> wrote:


>Your sig delimiter is still missing.

If it bothers you some much fix it yourself.
--
Ed Ruf ()
http://edwardgruf.com/Digital_Photog...ral/index.html

On 7/20/06 3:27 PM, Ed Ruf (REPLY to E-MAIL IN SIG!) wrote:
> On Thu, 20 Jul 2006 14:45:32 -0700, in rec.photo.digital John McWilliams
> <> wrote:
>
>
>> Your sig delimiter is still missing.
>
> If it bothers you some much fix it yourself.
> --
> Ed Ruf ()
> http://edwardgruf.com/Digital_Photog...ral/index.html

If you now put a space behind the two dashes, you'll have it nailed!

--
john mcwilliams

On Thu, 20 Jul 2006 15:31:24 -0700, in rec.photo.digital John McWilliams
<> wrote:

>On 7/20/06 3:27 PM, Ed Ruf (REPLY to E-MAIL IN SIG!) wrote:
>> On Thu, 20 Jul 2006 14:45:32 -0700, in rec.photo.digital John McWilliams
>> <> wrote:
>>
>>
>>> Your sig delimiter is still missing.
>>
>> If it bothers you some much fix it yourself.
>> --
>> Ed Ruf ()
>> http://edwardgruf.com/Digital_Photog...ral/index.html
>
>If you now put a space behind the two dashes, you'll have it nailed!

You did not get it. Given the implied attitude in your second mention of
it, right now as far as I'm concerned hell could freeze over first.
--
Ed Ruf ()
http://edwardgruf.com/Digital_Photog...ral/index.html

"Ed Ruf (REPLY to E-MAIL IN SIG!)" <> wrote:
>>
>>If you now put a space behind the two dashes, you'll have it nailed!
>
>You did not get it. Given the implied attitude in your second mention of
>it, right now as far as I'm concerned hell could freeze over first.
>--
>Ed Ruf ()
>http://edwardgruf.com/Digital_Photog...ral/index.html

Why not set your ego aside... and post correctly constructed
articles. It won't make him any more right or wrong, but at
least your articles won't be wrong every single time!

--
Floyd L. Davidson <http://www.apaflo.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska)

Conrad wrote:
> Hi,
>
> Working with JPEG files - does opening and closing cause lossy damage
> to image or do you have to perform tweaks (i.e., within Photoshop) to
> cause any potential loss of quality?
>
>
> TIA,
>
> Conrad
> Camp Sherman, Oregon
>
Try using Picasa2. No matter what you do to your image, Picasa2 retains
the original image. All tweaks can be cancelled easily, returning you to
your original image with no loss.
Morton
--

On 7/20/06 5:12 PM, Ed Ruf (REPLY to E-MAIL IN SIG!) wrote:
> On Thu, 20 Jul 2006 15:31:24 -0700, in rec.photo.digital John McWilliams
> <> wrote:
>
>> On 7/20/06 3:27 PM, Ed Ruf (REPLY to E-MAIL IN SIG!) wrote:
>>> On Thu, 20 Jul 2006 14:45:32 -0700, in rec.photo.digital John McWilliams
>>> <> wrote:
>>>
>>>
>>>> Your sig delimiter is still missing.

>> If you now put a space behind the two dashes, you'll have it nailed!
>
> You did not get it. Given the implied attitude in your second mention of
> it, right now as far as I'm concerned hell could freeze over first.

Of course, Ed, I am not a rocket scientist, but I swear most folks are
able to correct a sig delimiter without getting in a swivet.

YMMV, and, I know now, does.

--
john mcwilliams

Morton Linder <> wrote:

> Conrad wrote:
> > Hi,
> >
> > Working with JPEG files - does opening and closing cause lossy damage
> > to image or do you have to perform tweaks (i.e., within Photoshop) to
> > cause any potential loss of quality?
> >
> >
> > TIA,
> >
> > Conrad
> > Camp Sherman, Oregon
> >
> Try using Picasa2. No matter what you do to your image, Picasa2 retains
> the original image. All tweaks can be cancelled easily, returning you to
> your original image with no loss.
> Morton
> --

iPhoto does the same kind of thing ( as well as Aperture ) It keeps the
original and you can tweak the image to your hearts content. If you
don't like the changes/edits you can revert to the original and start
again anytime.

Ed Ruf wrote:
> On Thu, 20 Jul 2006 12:03:42 GMT, in rec.photo.digital Joe Makowiec
> <> wrote:
>
>> On 20 Jul 2006 in rec.photo.digital, Conrad wrote:
>>
>>> Working with JPEG files - does opening and closing cause lossy damage
>>> to image or do you have to perform tweaks (i.e., within Photoshop) to
>>> cause any potential loss of quality?
>> No. Only edits/resaves.
>
> Actually, one need not even edit. It is strictly the saving where the
> compression is applied. If you repeatedly open and resave a jpg, very
> quickly the loss in quality will be come readily apparent.
> __________________________________________________ ______
> Ed Ruf Lifetime AMA# 344007 ()
> http://EdwardGRuf.com

Nope, not unless your program is written by a total boob. No software I
am aware of recompresses an image to save if it hasn't been edited. If
you have such software, I suggest you get something worth loading into
your ram.