Edwin B. :
i created an algorithm with two for-loops for my gray image. Every pixel above the value 180 and on the left side of the image gets a new value.
This algorithm is very slow and takes a few seconds.
Is there a faster way to do this job?
for x in range(img.shape[0]):
for y in range(img.shape[1]):
if(img[x,y]>180 or y>450):
img[x,y]=255
William Miller :
You should employ vectorized numpy operations, something like
img[img > 180] = 255
img[:,450:] = 255
Should do exactly what your loop does, but much more quickly. To apply both conditions together you can do
img[:,450:][img[:,450:] > 180] = 255
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