If I remember correctly:

D1 and D2H differ in that D1 has only the native colourspace of the
camera, while D2H offers you selection of industry colour spaces (sRGB
to AdobeRGB). It seems you have AdobeRGB (Colour mode: II) set on the
camera? Of course, that doesn't apply if you shoot RAW because NEF
files are all in the native colourspace but the RAW converter outputs
the tiffs/jpegs into whatever space you have selected in its options (that can
be AdobeRGB, sRGB, ProPhotoRGB et cetera...).

OK, I don't remember exactly how it worked back in Photoshop 6 - but I
think it should be similar to newer versions. BTW, I am getting pretty
consistent results when editing on my monitor which is calibrated by a
gamma utility only similar to AdobeGamma. Nothing close to real
hardware calibration tool, but mostly good enough I think.

Any good editing program has a "working space". That is the colour
space into which all files are opened. It should be wide enough to
accommodate the space of the camera and to allow for subsequent
editing (e.g. sRGB is narrower compared to AdobeRGB, thus if you open
files shot in AdobeRGB in sRGB working space, you will loose colours).
For JPEGs, AdobeRGB is a pretty good choice for a working space, wide
enough.

So you should probably set the working space in PS6 to AdobeRGB, and
set your camera to the same colour space (look in the manual, usually
on Nikons it's colour mode II or IIsomething). That way the files open
straight in PS without any conversion.

Now, old D1 doesn't have any options for the colour space, so if you
shoot JPEGs it just pumps out whatever the JPEG engine incamera
outputs. IIRC, from what I have heard people had good luck _assigning_
NTSC profile to D1 jpegs.

Why? Read it here (quoted from NIKON TECH SUPPORT & DPREVIEW:)
**************************************************
http://www.dpreview.com/reviews/nikond1/page16.asp
When the D1's colour is set up (tuning colour by matching the colour seen on a 
monitor against reference patches) the engineers use monitors which have NTSC 
phosphors. Nikon re-iterated that this does not mean the D1 is shooting in any 
defined colourspace (certainly not NTSC 1953), however the NTSC profile 
conversion should produce the closest match to the initial intention. For exact 
colour space output Nikon recommend using RAW file format and Nikon Capture 
(which allows you to select the output colour space).
Click here for the official Nikon Europe Tech Support article on this
subject:
http://www.dpreview.com/misc/rdr.asp?url=http://www.nikon-euro.com/nikoneuro_en/hit/dc/dcd1/en/HIT_dcd1_en_21.htm
Here's an example of how such a profile conversion affects colour:
In the above example I used the following procedure (Photoshop 6):

    * Image -> Mode -> Assign Profile
          o Profile: NTSC (1953)
    * Image -> Mode -> Convert to Profile
          o Destination Space: [your space here]
**************************************************
So for your D1 jpegs, just think that they are similar to NTSC
profile, and upon opening them, assign the NTSC profile to them.
You should have Photoshop set up in a way that it asks you what to do
upon opening a file without embedded colour space profile.

I have tried myself assigning the NTSC profile to few D1 samples from
the web, and it indeed helps a lot with the colour casts.

So the procedure in Photoshop:

Edit/Colour settings/

Working spaces:
        RGB = AdobeRGB (1998)
Colour management policies:
        RGB = Convert to working RGB
Profile mismatches:
        all boxes ticked (ask when opening/pasting)
Missing profiles:
        ticked box (ask when missing)

If you shoot your D2H in AdobeRGB1998 space (which is the same as
NikonRGB I think, only different name), PS will just open the files
fine without converting. If you open a D1 file, it will ask you what
to do, then you select "assign profile" from the three options and
select the NTSC (1953) profile from all the available profiles and
click OK.

This is probably the easiest consisten way if shooting JPEG/TIFF
files.

Frantisek

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