How to make white pixel values black by keeping rest of pixel value as it it from an image

Question

i have an gray scale image which is showing black background, white leaf and some other color disease spots on it. What i want to do make white portion into black and making other than black and white pixels color into white.

img2 = cv2.imread('binary.jpeg')
binarr = np.where(img3 < 255 or img3 > 0, keep as it is, else make it 0)
plt.imshow(binarr)

but this seem like not supported by python.

any other suggestion to do this?

Answer 1

I labelled your question for numpy so you may get a better answer, also it is not clear what data type cv2.imread() actually returns so I've made an assumption it could be a list in which case:

binarr = [0 if pixel == 255 else 255 for pixel in img]

ie:

>>> img = [0,255,0,255,158]
>>> binarr = [0 if pixel == 255 else 255 for pixel in img]
>>> binarr
[255, 0, 255, 0, 255]