Equidistant colors

[David McFarlane]

Nate Vack in the PsychoPy Google Group 
(https://groups.google.com/d/topic/psychopy-users/PwEuTGO1vyg/discussion 
) also suggests HUSL, see http://boronine.com/husl/ .

-- David McFarlane


At 11/21/2013 01:36 PM Thursday, David McFarlane wrote:
>Tobias,
>
>Googling "equidistant colors" got me to 
>http://vis4.net/blog/posts/avoid-equidistant-hsv-colors/ .  And that 
>in turn reminded me of the CIE L*a*b* and HCL color spaces, which 
>you may look up on Wikipedia.  I think you can take it from there.
>
>-----
>David McFarlane
>E-Prime training 
>online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx
>Twitter:  @EPrimeMaster (https://twitter.com/EPrimeMaster )
>
>
>At 11/21/2013 12:27 PM Thursday, Tobias wrote:
>>This is not directly connected to E-Prime, but since some people 
>>are presumbly real experts in psychophysics here, I would like to 
>>ask anyway and I hope I can get some hints here.
>>
>>I would like to conduct an attention experiment in which I need to 
>>have 9 colors. These should be "equidistant". That is, they should 
>>be equally salient on a black background.
>>
>>The first thing I cam eup with was to use the HSV color space and 
>>varied the H value from 0 to 239 with equal distance while keeping 
>>the S and V value fixed.
>>The outcome is quite disappointing. The colors seem to be not 
>>comparable at all, some seem brighter, some darker and the 
>>subjective distance ('similarity') was rather variable.
>>
>>Does anyone have a good idea how to choose 9 color that are equidistant?
>>
>>Thanks a lot,
>>Tobias

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