# Contrast Levels in CreateProceduralGabor Function

**URL:** <https://psychtoolbox.discourse.group/t/contrast-levels-in-createproceduralgabor-function/992>\
**Category:** Uncategorized\
**Created:** [April 25, 2012, 7:38pm UTC](https://psychtoolbox.discourse.group/t/contrast-levels-in-createproceduralgabor-function/992 "2012-04-25T19:38:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\
**Post date:** [April 25, 2012, 7:38pm UTC](https://psychtoolbox.discourse.group/t/contrast-levels-in-createproceduralgabor-function/992/1 "2012-04-25T19:38:54Z")

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Hi Psychtoolbox Forum  
  
We have used the CreateProceduralGabor function to create a number of Gabors at different contrast levels. To manipulate the contrast we used the inbuilt contrast function. These values however, do not reflect to the _actual_ contrast levels (&nbsp; 'contrast' is the amplitude of your gabor in intensity units - A factor that is multiplied to the evaluated gabor equation before converting the value into a color value. 'contrast' may be a bit of a misleading term here...)  
Could someone help us to determine the actual contrast levels?  
  
That would be much appreciated!!  
  
Iza & Hannah