Open a jpg; save a jpg without loss; why not?

I just purchased Elements 8 to run under Windows 7.
If I open a jpg in the editor, why do I have to experience the loss of saving it as a jpg? It's already a jpg.
In Photoshop it is possible to open and save jpg's repeatedly without loss. But not in Elements? Why not?
I understand that I have the option to save the file in photoshop format and then save it as a jpg again only after the final editing is done and the image flattened.
And I understand that I have the option to save it as a high-resolution jpg more than once.
But in Photoshop neither of those processes is necessary.
It is inconvenient not to be able to open an existing jpg and save it as such, without having to experience the loss inherent in making it a jpg again, when it is already a jpg to begin with.
Clearly this problem has been solved in Photoshop. Why not in Elements?
Thanks.

Saving as a jpg implies loss.
save a RAW file as a JPG -- you have loss -- cannot be avoided because JPG files hold less datasave the same RAW file as a JPG and should get the same result -- same loss
when a JPG is loaded into PSE, the missing pixels are rebuilt by expanding the data to a normalized form, but this WILL differ from the original RAW, it has to since the JPG save discarded data -- so saving again as a JPG will also discard data and since the loaded expanded form differred from the original form, this new save will discard data a bit differently -- so you get accumulated loss - hopefully not as large as the first JPG save.
Does PhotoShop differ from this? I don't see how -- unless it retains the original and keeps changes (which I believe LR does and maybe NX2, not sure).
So you CAN eliminate compounding the loss by always applying edits to the original -- but that would seem like a difficult task when you get into layers for example, so perhaps PhotoShop can reduce it for some edits -- but I don't have photoshop so I cannot test.

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Geolaf wrote:
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-- I want to know if that image is in 256 color or not...

Mary Jo, since you are a newcomer, you may not yet understand that in any given Adobe forum, there are a whole bunch of conversations going on at the same time. Each one of these is about a certain "topic", described in the title and opening post. The discussion sometimes stays right on point, and sometimes veers off a bit, and there are often quick side-issues branching off from the main topic, but still related. Within limits, people here try to keep the discussion on a single general topic. For example, in this topic, the initial issue is whether there is a way, in Photoshop, to limit the number of colors in a JPEG image to 256; there were discussions about whether this could be done or not, and alternative programs that may be able to accomplish this, and a comparison of the file sizes for 256 bit images in different file types.
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[Edit: Trez hit "post" before I did. Trez-- I think she is using Photoshop, not Elements; she did say CS2.]

Open a jpg; save a jpg without loss; why not?

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