Mac OSX10.14; PsychoPy 3.02; stand alone, builder question
With a code component, I was trying to create a random gray checkerboard (uniform from -.7 to .7) with squares ~16pix by ~16pix with an np.array and blur it with something like Masks=ndimage.gaussian_filter(myImage, 15). I was trying to present with a grating component because I want to put it in a gaussian mask, but I couldn’t get it to work. Then wonder of wonders (bless you all) I discovered the new NOISE component in builder.
But I am having trouble with a few things with the new noise component. The measurement unit is in deg (but I could change that). I want a 4 x 4 deg noise (can do), with squares of a certain approximate size (got it: noise element size), put it in a gaussian mask (got it). Here are my problems. (1) When I ask from a random uniform distribution, I get the same random uniform distribution repeated across the screen 16 times (4x4; tessellated). (2) The only way I can see to blur it is in the Noise tab, select filtered. But then I do not know what the underlying random selection of gray levels (gaussian, uniform, etc.). (3) I am not sure what I am doing in the filtered tab. I want low frequencies, so I set low frequency cut off 0, but should it be 1? If I set low cut off to 1 and high cut off to 2, does that mean I get freq. between 1 and 2 cycles per degree.
My first problem is the Tessellation problem (1 above). I couldn’t find any documentation. I realize Builder documentation might not exist yet. I could probably figure some of it out with the coder documentation, but I couldn’t find that either.
I think that its absolutely great that you came up with the new coder type, just when I needed it.