imread always return "None"

Question

I am struggling to read a picture from certain directory.

img = cv2.imread('/Users/myname/Desktop/traindog.8011.jpg', cv2.IMREAD_COLOR) 
print (img)

I just simplified my code to make sure the issue and understand above. And even when I put the full path of the picture, it always returns 'None'. Where did I get a wrong ? Thank you in advance.

try cv2.imread(os.path('/Users/myname/Desktop/traindog.8011.jpg'), cv2.IMREAD_COLOR) — v.coder, Feb 27 '18 at 14:22
@v.coder that will result in a TypeError, because os.path is a Module. — deets, Feb 27 '18 at 14:23
Does imread return None for all images? How did you install opencv? — deets, Feb 27 '18 at 14:23
sry i meant using os.path.join('/Users/myname/Desktop','traindog.8011.jpg') — v.coder, Feb 27 '18 at 14:25
Can you read pictures from *other* locations/other pictures? — deets, Feb 27 '18 at 15:49

score 2 · Answer 1 · answered Dec 15 '18 at 20:58

2

I spend the whole night found that if your folder name has space then it can't read the file. So be careful with your folder name which you include to your path.

answered Dec 15 '18 at 20:58

jongli coder

31
4

The file name itself can't have a space too. – user239216 Mar 01 '22 at 07:41

score -4 · Accepted Answer · answered Feb 27 '18 at 14:54

-4

try this:

img = cv2.imread('\Users\myname\Desktop\traindog.8011.jpg', cv2.IMREAD_COLOR)

or

img = cv2.imread('//Users//myname//Desktop//traindog.8011.jpg', cv2.IMREAD_COLOR)

answered Feb 27 '18 at 14:54

yoram

191
1
1
13

are you sure the filename is correct? the path exists? is this happen with other images and folders? – yoram Feb 27 '18 at 15:37
3

This is not helpful advice. Neither is a double slash at the beginning of any meaning, nor does changing slashes around to backslashes make things better. In fact it makes them worse: \t is escape code for tabular, which you introduced. – deets Feb 27 '18 at 15:37
but with single slash it won't work no matter what, only with one of these options @deets – yoram Feb 27 '18 at 15:42
2

@yoram that is nonsense. There is no meaning defined for double forward slashes as you show. And the backslash string is still broken, and can't possibly work as path because the user is clearly on a mac, and the mac doesn't use backward slashes as path separaters. Look at `os.sep`. Just because a path is not working does not mean you get it to work by randomly doing things to it. – deets Feb 27 '18 at 15:49
can you share what was the problem? @user7421972 – yoram Mar 04 '18 at 09:22

imread always return "None"

2 Answers2