#Example code showing how to itterate through individual pixels using python
#looping constructs and making a per-pixel decision with an if statement.
#
#Jay Summet - Summer 2024
#
# OpenCV 4.5.x, Python 3.10
import cv2

#Because the color channels are the last "dimension", 2D slicing will 
#also automatically copy all 3 color channels.
#
a = cv2.imread("blueSky.jpg")
y,x,c = a.shape
print("x:", x, "Y:",y)

for y in range(0, y):
    for x in range(0,x):
        value = a[y][x][0]
        if value > 200:
            a[y][x] = (255,255,255)

cv2.imshow("Image", a)
cv2.waitKey(0)