SRGB jpeg color shift upon import to Lightroom

Hi all,
I've tried to do enough reading to ask and intelligent question, so here goes:
I have sRGB jpegs I shot on a Nikon D80. When I import them to Lightroom, there is a color shift (as compared to the camera LCD). If I open the jpegs in Photoshop (using the embedded profile, ie. sRGB), open the jpegs in Photoshop and assign ProPhoto as the color space, or open the jpegs in Firefox, there is no color shift.
Question #1 - Why is there a shift in LR?
Question #2 - The LR (Melissa) color space is often described as "ProPhoto with a sRGB tone curve". I've not seen the mention of a tone curve in reference to sRGB or aRGB color spaces. What is it?
Question #3 - When an image with an embedded profile is imported into LR, is is always assigned to the ProPhoto space, or would it be displayed in its native color space, and only assiged to ProPhoto upon editing?
Thanks,
Michael.

Reading your question, there are a few things that really worry me. First off, Lightroom assumes images with no profile to be in sRGB, second when the image has a profile or a profile tag (such as your D80 writes) it will honor the tag. You should completely forget about the internal working space in Lightroom. It is irrelevant. The way color management in Lightroom works is the following, you take an image in its source profile which defines the colors in absolute terms, render it into the working space (linear prophotoRGB) using the source profile, which does NOT change the color, and then convert to the monitor profile for display. This is how every color managed program does it. Some skip the working space step. This means that the working space, as long as it is wide enough, does not matter for the display.
>open the jpegs in Photoshop and assign ProPhoto as the color space
And this is extremely worrisome. You should NOT assign prophotoRGB to your image. You should leave it in its embedded space, or
convert to the working space. In general leave it in its embedded space. Your photoshop settings should be as the first image in this old post: http://lagemaat.blogspot.com/2007/12/mildly-lightroom-workflow-for-printing.html . If you need to assign prophotoRGB to your image to make it appear right, implies that your monitor profile is messed up majorly.
>open the jpegs in Firefox, there is no color shift
Firefox normally does not color manage, so it always lies to you. Only when you enable tyhe secret setting will it not lie to you (provided the monitor profile is good). See here on how to enable color management in Firefox: http://lagemaat.blogspot.com/2008/06/firefox-30-released.html
>Question #1 - Why is there a shift in LR?
On a good calibrated monitor the shift should be minor. There is a shift because of color management. The displays on Nikons are good, but you cannot trust them in absolute colorimetric sense. Your shift sounds much larger than normal, which is why we think the monitor profile is probably bad.
>Question #2 - The LR (Melissa) color space is often described as "ProPhoto with a sRGB tone curve". I've not seen the mention of a tone curve in reference to sRGB or aRGB color spaces. What is it?
Again, don't worry about the color space. It is not important but for knowing that it is wide enough to handle anything you throw at it. Lightroom internally uses a color space that is 16 bits and linear and has the primaries of prophotoRGB. It does NOT use a tone curve. For its histogram display and the percentage displays, it applies a sRGB tone curve to the data, so that not everything clusters on one side of the histogram. This is only done for those two displays! Lightroom works in a linear space for everything else. A good document on this was written up by Andrew Rodney a while ago: http://www.ppmag.com/reviews/200701_rodneycm.pdf . I discuss the tone curve here: http://lagemaat.blogspot.com/2008/06/srgb-tone-curve-and-lightroom-color.html
>Question #3 - When an image with an embedded profile is imported into LR, is is always assigned to the ProPhoto space, or would it be displayed in its native color space, and only assiged to ProPhoto upon editing?
Explained above. When you're working in Develop, the image is
converted to the internal color space using the embedded profile, any edits are applied, and then it is converted to the monitor profile before display. The step in between is immaterial. It even happens in 16-bit precision to avoid obvious bit steps. In the Library module the situation is slightly different because previews that are generated from your file are used, but the result is exactly the same. There is NEVER any color space assigned to your images, except when the original files have no profile. In that case sRGB is assigned.

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