我在另一个字行= 394和col = 700中具有高度= 394和宽度= 700的图像。但是当我尝试通过grey_img.pixel(row, col)
访问给定像素处的像素值时,出现了超出范围的错误。由于某些原因,grey_img.pixel(col, row)
可以工作。
有人可以帮助我找出原因,为什么在进行grey_img.pixel(row, col)
时出现超出范围的错误,而不是相反?
我认为索引会以(row,col)开头,因为
(0,0),(0,1),(0,2)...(0,699)
(1,0),(1,1),(1,2)...(1,699)
...
(393,0),(393,1),(393,2)...(393,699)
from PyQt5.QtGui import QImage, qGray
# read jpg image and convert it to grey scale.
grey_img = QImage("test_img.jpg").convertToFormat(QImage.Format_Grayscale8)
# print the pixel value of each pixel form the grey scale image.
img_height = grey_img.height()
img_width = grey_img.width()
print("height = ", img_height)
print("width = ", img_width)
# height = 394
# width = 700
for row in range(0, img_height):
for col in range(0, img_width):
# works
gray_val = qGray(grey_img.pixel(col, row))
# does not work
# gives out of range error
# QImage::pixel: coordinate (179,482) out of range
# gray_val = qGray(grey_img.pixel(row, col))
答案 0 :(得分:2)
QImage::pixel
函数将(int x, int y)
用作参数(column, row)