CIE chromaticity diagram is a 2-D diagram in a 3-D (xyz) space, so the best way to present it is to draw it in the 3-D xyz space and allow it to be looked at from different angle. This will be done here when Java2 is widely supported by browsers without going through the plug-in hassle.   

Since it is impossible for a color monitor with RGB phosphors to display the full spectrum of colors of a true CIE diagram, the part that has negative x, y, or z values are displayed by adding white to them.

The following table lists different variants CIE 1931 chromaticity diagram

These diagrams are applets, so it may take a few seconds to draw on a slow computer, but it is accurate to the limits of the displaying monitor while keeping a small download file.  The problem with using image files for CIE diagrams is that they are either very large bitmap files or compressed lossy files such as JPEG that lose some color accuracy.  These applets will be available as a downloadable JavaBeans for plugging into your application soon.

These diagrams are based on 1931 2-degree CIE xyz color matching functions that remain international standards in both colorimetry and photometry.  International Telecommunication Union uses 1931 CIE color matching functions in their recommendations for worldwide unified colorimetry (ITU-R  BT.709-4, ITU-R  BT.1361).  Most color monitors comply with the standard.  This makes it possible to display 1931 CIE diagrams correctly on different color monitors.  

There are other color coordinate systems most of which are not any kind of  transform of 1931 CIE system, so it is impossible to display diagrams of those system correctly on different monitors that are calibrated with 1931 CIE system.

Gamma value 2.2 is most commonly used for CRT's.  To find out the correct gamma of your display device, please check its documents or do an exercise.

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