Photoshop jpeg compression

V
Posted By
vijay
Aug 28, 2004
Views
485
Replies
10
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Closed
Hi,
I need to send someone a whole lot of jpegs by mail. Now somebody told me that when i save jpegs from Photoshop, i can set the quality to 1 (image options) and save them. Later, once the files are received, it can be resaved to a higher quality (12 something) and then the images will be fine. Is that true??? Does it really help to save as 1 initially and then save as 12 to retrive better quality??

Thanx for the help in advance.

Vijay

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DT
deco_time
Aug 28, 2004
In news:Vijay typed:
Hi,
I need to send someone a whole lot of jpegs by mail. Now somebody told me that when i save jpegs from Photoshop, i can set the quality to 1 (image options) and save them. Later, once the files are received, it can be resaved to a higher quality (12 something) and then the images will be fine. Is that true??? Does it really help to save as 1 initially and then save as 12 to retrive better quality??
Thanx for the help in advance.

Vijay

JPEG is a lossy format, meaning that information is thrown away during compression; that information cannot be recovered. Furthermore, everytime you save the image, you’re compressing the image more, throwing away even more data. Not only will you NOT get the original image back when resaving, you’ll reduce quality even more.


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VR
Val Ray
Aug 28, 2004
On 8/28/04 7:00 AM, in article
, "Vijay"
wrote:

Is that true??? Does it really help to save as 1
initially and then save as 12 to retrive better quality??

No.
Best to zip or stuff your files.
T
tacitr
Aug 28, 2004
Now somebody told
me that when i save jpegs from Photoshop, i can set the quality to 1 (image options) and save them. Later, once the files are received, it can be resaved to a higher quality (12 something) and then the images will be fine. Is that true???

Absolutely, positively not, as a simple experiment will show you.

JPEG loss is *irreversible*. When you save a JPEG, the image quality is degraded. Once this happens, absolutely nothing can bring back the lost quality. Saving a JPEG again with a higher quality *does not* bring back the image information.

Sorry…


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TooSano4U
Aug 28, 2004
"Tacit" wrote in message
Now somebody told
me that when i save jpegs from Photoshop, i can set the quality to 1 (image options) and save them. Later, once the files are received, it can be resaved to a higher quality (12 something) and then the images will be fine. Is that true???

Absolutely, positively not, as a simple experiment will show you.
JPEG loss is *irreversible*. When you save a JPEG, the image quality is degraded. Once this happens, absolutely nothing can bring back the lost quality. Saving a JPEG again with a higher quality *does not* bring back
the
image information.

Sorry…
Why did the invent those damn files and make them so necessary for so many utilities!
That sucks!
JM
John McWilliams
Aug 28, 2004
Tacit wrote:
Now somebody told
me that when i save jpegs from Photoshop, i can set the quality to 1 (image options) and save them. Later, once the files are received, it can be resaved to a higher quality (12 something) and then the images will be fine. Is that true???

Absolutely, positively not, as a simple experiment will show you.
JPEG loss is *irreversible*. When you save a JPEG, the image quality is degraded. Once this happens, absolutely nothing can bring back the lost quality. Saving a JPEG again with a higher quality *does not* bring back the image information.

Sorry…

Very much like the video processors who tell you to "get DVD quality" disks made at their shop, and then say bring in the VHS tapes to make ’em from…..now I suppose terrific engineering and processing could buff up digitized images from a VHS tape, but not by these people!


John McWilliams

Help stamp out gratuitous apostrophe’s and exclamation point’s!!!
X
Xalinai
Aug 29, 2004
Watashee wrote:

"Tacit" wrote in message
Now somebody told
me that when i save jpegs from Photoshop, i can set the quality to 1 (image options) and save them. Later, once the files are received, it can be resaved to a higher quality (12 something) and then the images will be fine. Is that true???

Absolutely, positively not, as a simple experiment will show you.
JPEG loss is *irreversible*. When you save a JPEG, the image quality is degraded. Once this happens, absolutely nothing can bring back the lost quality. Saving a JPEG again with a higher quality *does not* bring back
the
image information.

Sorry…

Why did the invent those damn files and make them so necessary for so many utilities!
That sucks!

JPEG is a fine format for web publishing, for transferring extremely large images and for lots of other applications where filesize it the important factor.

The existence of JPG makes it easy to find devices that are designed for amateur use only: If JPG is the only format a device uses to store images (cameras) or if a scanner uses JPG compression to improve data transfer (Mustek and others, for USB1.1).

And above all: Nobody forces you to use JPG for intermediate steps in your workflow. Keep a lossless version (TIFF, PSD, PNG, even BMP) of anything you create and use conversion to JPG as the last step of your workflow where the required output format is JPG.

JPG isn’t evil by itself, only in combination with ignorant users.

Michael
TooSano4U
Aug 29, 2004
"Xalinai" wrote in message
Watashee wrote:

"Tacit" wrote in message
Now somebody told
me that when i save jpegs from Photoshop, i can set the quality to 1 (image options) and save them. Later, once the files are received, it can be resaved to a higher quality (12 something) and then the images will be fine. Is that true???

Absolutely, positively not, as a simple experiment will show you.
JPEG loss is *irreversible*. When you save a JPEG, the image quality is degraded. Once this happens, absolutely nothing can bring back the lost quality. Saving a JPEG again with a higher quality *does not* bring back
the
image information.

Sorry…

Why did the invent those damn files and make them so necessary for so many utilities!
That sucks!

JPEG is a fine format for web publishing, for transferring extremely large images and for lots of other applications where filesize it the important factor.

The existence of JPG makes it easy to find devices that are designed for amateur use only: If JPG is the only format a device uses to store images (cameras) or if a scanner uses JPG compression to improve data transfer (Mustek and others, for USB1.1).

And above all: Nobody forces you to use JPG for intermediate steps in your workflow. Keep a lossless version (TIFF, PSD, PNG, even BMP) of anything you create and use conversion to JPG as the last step of your workflow where the required output format is JPG.

JPG isn’t evil by itself, only in combination with ignorant users.
Michael
Well, you did a great job of proving our point. That they are a pain in the ass. Personally I avoid them in my work.
FB
Frederic Banaszak
Aug 30, 2004
JPG isn’t evil by itself, only in combination with ignorant users.

Well, you did a great job of proving our point. That they are a pain in the ass. Personally I avoid them in my work.

Which, JPGs or ignorant users?
X
Xalinai
Aug 30, 2004
Frederic Banaszak wrote:

JPG isn’t evil by itself, only in combination with ignorant users.

Well, you did a great job of proving our point. That they are a pain in the ass. Personally I avoid them in my work.

Which, JPGs or ignorant users?

Both, if you can :-))
TooSano4U
Aug 30, 2004
AHAHAA!
"Frederic Banaszak" wrote in message
JPG isn’t evil by itself, only in combination with ignorant users.

Well, you did a great job of proving our point. That they are a pain in
the
ass. Personally I avoid them in my work.

Which, JPGs or ignorant users?

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