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Displaying images stored as numpy array


#1

How do I display gray-scale images available as 2D numpy array? I think this was discussed on the old forum, but I can’t find the solution anymore. Thanks.


#2

http://www.psychopy.org/api/visual/gratingstim.html ?


#3

Indeed, GratingStim should work with gray-scaled images. Is there a more general method that will work with full color image, ie. when a matrix for each of the RGB channels is provided?
ATM, the imshow method from opencv library seems to better fit what I’m trying to achieve.


#4

ImageStim and GratingStim can both take RGB numpy arrays. GratingStim is appropriate if you want multiple cycles of your image/texture and ImageStim is for when you don’t.


#5

What these do better than imshow is they load your array onto the graphics card in advance (so timing is good) and can then modify the shape/position/size/opacity/… on the fly with minimal overhead.


#6

I would prefer ImageStim, but how do I supply the numpy array to the constructor? Should I just link it with the image keyword instead of the filename string?

EDIT: Ok, so it seems that ImageStim constructor accepts numpy array as image argument