See my response in your other thread

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HTH

Bob

(change the xxxx to gmail if mailing direct)


"Joe Burns" wrote in message
...
I have some similar but different questions about using color and
conditional
formatting in Excel.

1st, it looks like Excel 2007 may finally allow users to format cells by
RGB
code but I haven't yet figured out how exactly to make it work in the MS
online Excel 2007. I find MS elusive on the subject. Like "Diana", I do
not
want to go to the "extreme" of learning and using VB if possible. Right
now,
I'm using Excel 2003.

I'm a holographer who wrote a small BASIC program in 1979 for following a
single ray through the hologram design process. It starts with a small
number
of knowns about the finished hologram and ends with the correct optical
setups for recording that hologram.

I used CPM based Supercalc to enhance the program, moved it to DOS based
Lotus 123 and it now functions in Excel 2003. As part of the design
process,
the current version allows a user to previsualize the colors of the final
hologram from each of three eye positions perpendicular to the top,
middle,
and bottom of the hypothetical hologram. It allows the user to "see" the
colors the eye will see at each of those three positions at the top,
middle,
and bottom of the hologram.

The spreadsheet generates the colors as wavelengths in nanometers and
converts the values to text in a vlookup table so the user has both
numerical
wavelength values and textual color representations. See example below:

Eye Red
Light red
Orange


Light red
Eye Orange
Yellow


Orange
Yellow
Eye Yellow/green


I have found a couple of very nice little freeware programs online which
will convert wavelength values to RGB values. I can make a lookup table
for
the 430 visible integer wavelengths which will give their respective RGB
values.

MY PROBLEM: I can't figure out how to use those RGB values to
conditionally
format my cell background colors so I can have a "true" color
representation
in each cell in addition to the text I now use. I originally requested
this
as a feature from MS in the early 90s.

Here is the URL for one of the sites:
http://www.efg2.com/Lab/ScienceAndEn...ng/Spectra.htm The
aforementioned
zip file is at the bottom of the URL.

One of these days, I'll bite the bullet and figure out how to convert the
xls to Mathcad and drive an interactive diagram ;-)

Regards,
Joe Burns