Converting .NEF to .JPG color problem

When I convert a .NEF picture to .JPG the color is significantly desaturated.  I know JPG is highly compressed from NEF and figured the color loss was a result of the compression, but then I found out I can open the JPG back into Photoshop and the normal color is back.
Alos, I can convert .NEF to .PNG and the color stays normal.
I am trying to get into taking pictures in the Raw format, but this issue is frustrating me.
I would really appreciate any information about this problem.

One last hing to add, since you did not mention how you determined there is a difference between png and jpg. I am going to assume you saw the differences using a web browser, since those formats are common for that app.
Not all browsers treat those file formats the same. Some recognize the color profile and others don't. some may reconize for one format and not the other as well. So to verify it would be best to load them back into photoshop to see if there is a diffence. Also it can make a difference if you use the normal save or save for web as save for web does strip the meta data. I am assuming it strips the color profile as well, but I did not test this so I could easily be wrong. Seams to me I recall CS4 adding an option to specify the color profile, but again I could be wrong.
But if you need the color profile to be correct these are things you will need to verify.

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