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Newbie question about square waves

Just getting started with PsychoPy, and forgive the newbie question, but I’d like to make a sqr grating in Builder that is red and black, or green and black. Tried playing with grating parameters, but nothing obvious to me helped. Any solutions?
Thanks!

Does this help?

https://groups.google.com/forum/#!topic/psychopy-users/WQfw2PKUHg4

Yes, thanks! Not obvious is that you cant do textures in pix units.