The Colourized Zebra Effect

Extreme Black OR White
img[img>0.50] = 1
img[img<=0.50] = 0
working with Python Numpy arrays

Greyscale with void in the center
img[img>0.50] += 0.25
img[img<=0.50] -= 0.25
img[img>1.0] = 1.0
img[img<0.0] = 0.0


Striped
for i in range(img.shape[0]):
if stripe:
for j in range(img.shape[1]):
img[i,j] = abs(img[i,j] -1)
with stripe toggled every 50 lines (i.e. i)

To get moving stripes,
the toggle point is sequentially incremented
throughout the entire range
(e.g. instead of toggling at [0,10,20...]
it's toggled at [1,11,21...];
and then, more so on the next line)

Greyscale Striped

Tighter Stripes

With Greyscale

Ever Smaller Stripes
simply toggling the switch more often

Black OR White
Toggled Every Line

Greyscale
Constant Toggle

It's a subtle effect,
sort of like embossing,
(the effect being more pronounced on full size images).

Colorized Version
utilizing the above effects
independently on the R,G,B color bands

eList = [(w,e) for w in [1,10,25,50]
  for e in [black_white,grey_shift]]
i.e. I tried a lot of combinations.
It's hit or miss with image effects.