hello guys i have a question

here my CIE Diagram with focus on the blue primary color:

http://img121.imageshack.us/img121/1774/dfga.jpg


The x/y values are much close

but why is the delta E value so high?

Confusing me :confused:

Or is sth. like an error in my way of thinking ?


thnx for help fireskyer

Just a guess, but the blue primary's luminance could be way off.
Best bet if you're looking for help is to save your HCFR *.chc file, zip it, and post it, rather than just a single screenshot.

When the xy coordinates (or uv coordinates) are very close and the dE is still large, the ONLY factor can can be "off" is Luminance of the color -- color's 3rd dimension.

The color chart only shows 2 dimensions (xy or uv). The third dimension exists above (lighter) and below (darker) the "slice" of the color space you see on the chart.

Also when dE is calculated in uvL space, the errors are often larger than the dE numbers calculated in xyY color space. So you need to determine if your software is using uvL or xyY for dE calculations when you are measuring color.

Most calibration software uses all 3 coordinates (xyY or uvL) to calculate dEs for COLOR measurements, but when measuring grayscale, most software will use only xy or uv because Gamma will tell you whether each step has about the right luminance or not. But you COULD also use xyY or uvL to calculate dE for grayscale steps rather than xy or uv (though whether you can get your software do do this depends on the software's flexibility).

Luminance is not a "constant" either. uv or xy coordinates are "constants" for xy or uv grayscale or color measurements, but the target luminance value depends on how bright the white measurement is. You make the white measurement first, and the software will then know how bright the luminance is for each color measurement. Make your white brighter, and the target luminance will change for each color. So you have to be careful when making these color measurements that you use the same stimulus level for white and the colors... for example, if you measure 100% white, you have to measure 100% red, etc. If you measure 75% white, you have to measure 75% red, etc. You can use any stimulus level you like, as long as it is the same for each color measurement.