[photo-3d] RE: misconception of matching photoshop colours

[Andrew Woods <A.Woods@xxxxxxxxxxxxxxxxxx>]

Monte Ramstad wrote:
> Thanks for this informative post.  I have often wanted to know the
> spectrum from a CRT.  Do you happen to know how variable the spectra 
> of CRT's are?

It does vary somewhat but I don't have that data at hand...

> Also, would you be willing to share the raw data, for example
> as a text file?

Fortunately Gabriel's very informative followup post has probably
answered this request.  The images at 
http://www.zdnet.co.uk/pcmag/trends/1999/07/13.html
are very similar to the results I have here.  (Thanks Gabriel!)

Chris Jones wrote:
> Bob Maxey wrote:
> >It must be pointed even identical monitors will have slight differences.
> >Do not forget that color can be adjusted by the user so anaglyphs to be
> >viewed might require an adjustment by the user. You cant create an image
> >that will display from monitor to monitor without some fiddling.
> 
> I don't think that's what he meant - the image on a CRT is a superposition
> of 3 different coloured images. When you colour balance a monitor, you
> alter the amount of each of these 3 that you see, not 3 the colours
> themselves. 

Chris is correct.  The colour balance or colour temperature control
available on some monitors only varies the relative amounts of red,
green and blue the monitor uses to produce "white".  It does not
change the colour frequencies produced by the red, green and blue
phosphors.

It does however raise the question of whether changing the colour
temperature control will affect the quality (or relative ghosting)
of an anaglyph image.  I think not.  Anyone care to comment?

Cheers,
Andrew.