如何使用线条轮廓找到图像上像素的亮度

Question

我正在尝试沿着图像的水平线找到像素的亮度，但我坚持如何获取数字数组，或者可能使用循环来更改 x 值并输出像素的值，所以我可以计算每个的亮度，然后可以对该线进行平均。这是我到目前为止得到的：

from PIL import Image
from math import sqrt
import os 
image = Image.open(os.path.join("mypath", "a.jpg"))
import numpy as np
image = imag.convert ('RGB')
X,Y = (137, 137) #this is where i dont know what else to add
pixelRGB = imag.getpixel((X,Y))
R,G,B = pixelRGB
brightness =([R,G,B])/3
print(brightness)

我不知道如何添加循环。

Answer 1

你应该用循环从 0 迭代到宽度

from PIL import Image

image = Image.open("1.png")

width, height = image.size
y = 137

brightness_values = []

# Loop through the horizontal line
for x in range(width):
    pixelRGB = image.getpixel((x, y))
    R, G, B = pixelRGB

    
    brightness = (R + G + B) / 3  


    brightness_values.append(brightness)


print(brightness_values)


average_brightness = sum(brightness_values) / len(brightness_values)
print(f"Average brightness: {average_brightness}")