Unless your shooting is for the web, use #4, Adobe RGB. It's the standard for most print applications, and is a gamut that is well matched to the camera's sensor. sRGB is too small.

Michael

And a different point of view...

Since:

1) I primarily shoot RAW, and

2) as already pointed out, the color matrix chosen only applies to the in-camera jpegs, and

3) when I shoot jpegs it is usually because I only want snapshots to email or post on the web

I prefer to leave the color matrix set to the skintone sRGB setting since this usually allows me to post/email the images with very little adjustment after the fact.

IF you choose to use Adobe RGB, then you will need to convert the profile before emailing or posting, lest the image appear "flat" onscreen.

Cheers,
Jack

True, but any way you slice it, the histo is still being generated off an 8-bit jpeg...  

I really only use the lum-histo to verify nothing is blown by leaving a notch of headroom at the right.  Since the tops and bottoms of the two colorspaces occur at the same points, I am not really losing any working information from an exposure point of view.  Lastly, the skintone RGB is flatter contrast and lower saturation than Standard or High, and gets pretty close to the 8-bit ARGB histo anyway.

Hello.  I just purchased a 1Ds.  There are five color matrix settings, four sRGB and one Adobe RGB.  What setting do you use and why?  I plan to shoot RAW.

Thanks

If you're shooting RAW, the color matrix doesn't affect the image data at all, but it does affect the camera histogram. I use Adobe RGB because it is the closest setting to the camera sensor's native color gamut, which makes the RAW and histogram match pretty well.

But then the histogram and RAW match less closely.