C  O  L  O  R    V  I  S  I  O N 

This corner is a collection of color vision related materials. Most of them are the tools and results of Biyee's ongoing exploration in the color vision land.  It is the author's hope that sharing these materials will be a small contribution to the understanding of color vision, application of color vision knowledge in the real world and helping people with color vision deficiency.

Guideline

• The commonly accepted language (not necessarily the best one) to describe colors quantitatively is CIE color coordinates.  The 1931 CIE color matching functions remain as the international standard used in color monitor manufacturing.  This site frequently uses color monitor to present color objects.  1931 CIE Diagrams are the foundation components for building this site and they are essential for understanding many materials of this site.
• Copunctal Points are essential for creating confusion lines for dichromats (people who have only two types of cones instead of three that normal people have).
• Confusion Lines are the lines in a color space such as CIE chromaticity diagram on which colors are not distinguishable to certain dichromat.   
• Color Vision Test is an online test based on Confusion Lines It tests different types of color vision deficiencies: tritanopia - blue blindness which is very rare,  deuteranopia - green blindness, protanopia - red blindness.   The latter two are more common and are difficult to distinguish from each other by quick test such as this one. 
• Spectral Curves compare two sets of spectral curves (e.g. color matching functions, cone fundamentals).
• Color Space explains color space and the rationale behind using CIE 1931 color space on this site.
• Color appearance simulation expresses the author's view on color apperance simulation and poses some questions about the current technology in this area.
• VPMODEL is a product of the author's Ph.D. thesis work some years ago.  It is mainly for studying why animals have different types of color visions.  However it has many tools to deal with underwater spectral irradiance change, spectral reflectance, target radiance, photopigments' spectral absorptance, etc.
• Benham's Top is one of the interesting subject color phenomena. 
• The author has his favorite Books and Links.
• About this corner tells the background of this color vision corner.