# How to display well calibrated CIE colors?

**URL:** <https://psychtoolbox.discourse.group/t/how-to-display-well-calibrated-cie-colors/1807>\
**Category:** Uncategorized\
**Created:** [April 19, 2007, 2:43am UTC](https://psychtoolbox.discourse.group/t/how-to-display-well-calibrated-cie-colors/1807 "2007-04-19T02:43:39Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![xeos](https://avatars.discourse-cdn.com/v4/letter/x/ecae2f/32.png) [@xeos](https://psychtoolbox.discourse.group/u/xeos)\
**Post date:** [April 19, 2007, 2:43am UTC](https://psychtoolbox.discourse.group/t/how-to-display-well-calibrated-cie-colors/1807/1 "2007-04-19T02:43:39Z")

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Hi,  
  
I'm doing some color induction experiments, and need to allow the user  
to adjust the color of a test-patch to match the induced color on the  
CRT. I would like to do this in the CIE colorspace.   
  
The toolbox includes RenderDemo.m, which shows how to find the RGB  
value for a given xyY, but requires a calibration file. I'd like to  
generate such a calibration file, but it appears that all of the  
routines require a PR650, or some equivalent device which measures  
SPD, whereas I have a CRS ColorCal, which only measures xyY. Is there  
a way to modify this code so that a color meter can be used instead?  
Or is there some other approach (other than trial-and-error) to  
converting from CIE to RGB? I've found various matrices posted on the  
web which convert between the two spaces, but none make very accurate  
conversions, since they are not calibrated to the monitor we are using.   
  
Thanks!