Color resources and links
For an application of the tools presented in this page, see the paper:
B. Gralak, G. Tayeb and S. Enoch. Morpho butterflies wings color modeled
with lamellar grating theory. Optics Express Vol. 9, No 11, p.567-578,
2001, http://www.opticsexpress.org/abstract.cfm?URI=OPEX-9-11-567
Many links about color : http://www.elapro.net/vision.htm
Educational Color Applets HomePage : http://www.cs.rit.edu/~ncs/color/
Charles Poynton - Color technology : http://www.poynton.com
Colour Physics FAQ : http://www.colourware.co.uk/cpfaq.htm
Color Science : http://www.physics.sfasu.edu/astro/color.html
Color links from Digital Color web site: http://www.digitalcolour.org/Links.htm
Many useful things about color: http://www.easyrgb.com
CIE illuminants D50 and D65:
CVRL Color & Vision database: http://www.cvrl.org/
D65 by 1 nm steps (local copy)
D65 by 5 nm steps (local copy)
Polynomial approximant (local)
CIE 1964 Spectral Tristimulus Values x_bar, y_bar, z_bar :
http://www.physics.sfasu.edu/astro/color/cie_xyz1964.html
CVRL Color & Vision database: http://www.cvrl.org/
Local copy
PPM file format :
Local information on PPM file structure: in postscript
format, in PDF format
Examples of PPM files:
PPM file with colors coded with 16 values
PPM file with colors coded with 256 values
These are very small images (4x4 pixels), you should zoom on them a lot
in order to see them conveniently.
If you do not have the appropriate software to see them, I recommand the
image visualiser IrfanView, http://www.irfanview.com
which works under Windows. You should preferably set the option "View /
Display Options / Fit images to desktop".
In any case, you can see the content of these text files with any text
editor.
Using PPM/PGM - Eric Weeks - personal pages - graphics techniques Using
PPM to make high-quality color pictures. including a C program which produces
PPM output, ... :
http://www.physics.emory.edu/~weeks/graphics/mkppm.html
Gérard TAYEB
Nov. 13th, 2003