# OS9: linearize clut after calibration?

**URL:** <https://psychtoolbox.discourse.group/t/os9-linearize-clut-after-calibration/727>\
**Category:** Uncategorized\
**Created:** [October 25, 2004, 10:57am UTC](https://psychtoolbox.discourse.group/t/os9-linearize-clut-after-calibration/727 "2004-10-25T10:57:12Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mega\_str](https://avatars.discourse-cdn.com/v4/letter/m/7cd45c/32.png) [@mega\_str](https://psychtoolbox.discourse.group/u/mega_str)\
**Post date:** [October 25, 2004, 10:57am UTC](https://psychtoolbox.discourse.group/t/os9-linearize-clut-after-calibration/727/1 "2004-10-25T10:57:12Z")

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Hi all  
I would like to ask you what is the correct procedure to linearize   
the cluts if you can utilize a professional calibrator (eye-one   
display GretagMacbeth) . i mean after having calibrated the   
monitor could I just use as clust three arrays between 0:255   
linearly spaced or should I need to use some additional   
calibrating procedures?  
I was used to calibrate the monitor using the functions in   
PsychCal that are used in the Psychtoolbox demos but now that I   
have the possibility to use the calibrator I suspect that these   
procedures are either obsolete or misleading. am i right?  
Thanks in advance  
Alessandro