Marie,
I don't even mention the name Pantone in my doc. With a little help
from a friend I found a data base.
Pantone changes the values occasionally a little. Especially there is
some uncertainty about the CMYK represention (which is anyway
only valid for a specific Pantoe process). In any case of doubt define
your CMYK process in Photoshop's Color Settings, define the Spot
color by Lab and read the equivalent CMYK values. Many Spot
colors are out of gamut for sRGB or AdobeRGB (see my doc - if
a number 0 or 255 for R,G,B appears, then the RGB values are
clipped. As well, many Spots cannot be reproduced by any CMYK
system.
D50 is the observer illuminant and the reference for Lab for paper
prints, a convention.
D65 defines the reference white point for some RGB color spaces
like sRGB and AdobeRGB, but not for all:
http://www.fho-emden.de/~hoffmann/cielab03022003.pdf
page 10
D65 is mostly used as monitor white. Some people consider it
as a contradiction: monitor D65 - print D50 .
Practically it works - a matter of adaptation (one doesn't view
the monitor and a print side by side).
Best regards --Gernot Hoffmann
