Topic awaiting preservation: Warj/Steve & other heavy hitters (Page 1 of 1)

I was thinking about the bunch of you while while I was going under for the 3rd time! But I couldn't stop...

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This article explains how, given light with an arbitrary spectrum, first to determine the CIE X, Y, and Z values which characterize a standard human observer's perception of its colour, then to calculate corresponding R, G, and B values for a display device with known primary colours. A companion C program illustrates the techniques and contains functions you can use to render spectra in your own programs.

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http://www.fourmilab.ch/documents/specrend/

The site http://www.fourmilab.ch/is a mindblower..well at least for this tired old blown mind it is...

I don't use screensavers but couldn't resist

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shows the sky above any location on Earth, including stars (from the Yale Bright Star Catalogue of more than 9000 stars to the 7th magnitude), the Moon in its correct phase and position in the sky, and the position of the Sun and all the planets in the sky.

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You really have to look around.

Brought to you by John Walker. AutoCad ring a bell?

I ain't heavy.
But thanks for thinking of me anyway. (Unless you meant another Steve???)
Good links too. Not exactly what I associate with the name "John Walker", but better for me I guess.


Pretty diverse collection of stuff on that site. Wonder if his science fiction is any good....

Thanks!

Links:

Easy RGB
Decent set of conversion formulas.

colors.f90
Fortran source code for colour conversion (one of my favorites).

Color Models for MapInfo
Good mix of model and conversion information.

Colour Design Tutorial
Another good mix.

Chapter 4: Colour
Touches on a variety of subjects.

color models & color wheels (mirror)
Some of the better basic info on Lab that I've been able to find.

I also have a list of white points in MatLab format. Haven't completely untangled them, though, because I'm not familiar with the format.

Also been doing some reading about XYZ <> Lab recently.
Came across some interesting junk.
Found one guy that trash talks Lab, but I don't know if he makes any valid points because I don't know much about the hardware independence aspects.

For XYZ<>RGB, I've found several different sets of numbers.
I think this is due to white point, but I haven't looked hard enough just yet.

It's been awhile, but I might have some more junk/observations laying around.
But don't hold your breath because I'm not in the mood to be heavy anymore.

edit:
Duh! It's right there in one of those links.
http://www1.tip.nl/~t876506/ColorDesign.html#coef

Enjoy.

(Edited by warjournal on 10-26-2004 14:37)