[英]Replacing certain values in Python List
I have created a list for displaying a black/white (binary) image with its pixel values.我创建了一个列表,用于显示带有像素值的黑白(二进制)图像。 However for the calculations I am running I can not work with 0s represented by the black pixels.
但是,对于我正在运行的计算,我无法使用黑色像素表示的 0。 I have been trying to convert the 0s to 1s with the following code but it does not work despite producing no errors:
我一直在尝试使用以下代码将 0 转换为 1,但尽管没有产生错误,但它不起作用:
from PIL import Image
img = Image.open('C:/Users/binary.png', 'r')
WIDTH, HEIGHT = img.size
data = list(img.getdata()) # convert image data to a list of integers
data = [data[offset:offset + WIDTH] for offset in range(0, WIDTH * HEIGHT, WIDTH)]
for (i, item) in enumerate(data):
if item == 0:
data[i] = 1
for row in data:
print(' '.join('{:3}'.format(value) for value in row))
It might be noteworthy that when I try "item = 255" I get the following error: "TypeError: '<' not supported between instances of 'list' and 'int'"值得注意的是,当我尝试“item = 255”时,出现以下错误:“TypeError: '<' not supported between 'list' and 'int'”
However this error doesn't make sense to me as when I do type(data) I get list output但是这个错误对我来说没有意义,因为当我输入(数据)时,我得到了列表输出
data
is a list of lists, you need nested loops. data
是一个列表列表,你需要嵌套循环。
for row in data:
for i, value in enumerate(row):
if value == 0:
row[i] = 1
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