Cannot change Gabor patch size

Comments

• eduard

  April 2019

  Hi Jasper,

  Not sure why (maybe intentional, maybe a bug), but the size keyword doesn't do anything if you use a gaussian envelope on your grating. To manipulate the size, you have to instead change the "stdev" keyword. For Gaussian Gabors, size is defined as 6* the stdev. see here (function: _mask): https://github.com/smathot/OpenSesame/blob/koffka/openexp/_canvas/_element/psycho.py

  Eduard

  @sebastiaan, if this intentional, we should update the documentation; if not, we should fix it.

  
• JasperdeWaard

  April 2019

  Hi Eduard,

  Thanks, that's very enlightening!

  Cheers, Jasper
• sebastiaan

  April 2019

  Hi guys,

  Thanks for pointing this out. The meaning of the size keyword is indeed a bit confusing. Strictly speaking, the size of a gabor patch is infinite, and the stdev keyword just indicates how quickly the patch fades away, so to say. But practically speaking, there's of course an image with a finite size, and that's what the size argument refers to, except that for the psycho backend the size is chosen so large that the patch always looks infinite. (I don't recall why, to be honest.)

  Long story short: I'll update the docs to clarify this!

  Cheers,

  Sebastiaan