How can I properly convert image to gray scale in opencv

Question

I want to find contours on the image below (white bubbles). The problem is that when I convert the image to gray with the standard way:

   gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

I do not see them (second image). Is it possible to change the conversion some how? Thank you for any help

Please show the complete code which you are using. Maybe the problem is somewhere else. — sgarizvi, Apr 15 '19 at 10:13
Then please add your solution as an answer so that other users can also know the cause of problem and its solution. — sgarizvi, Apr 15 '19 at 11:33

score 1 · Accepted Answer · answered Apr 15 '19 at 10:15

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import cv2
img = cv2.imread("WNrrP.png")
img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
cv2.imshow("h",img)
cv2.waitKey()

This works correctly for me

answered Apr 15 '19 at 10:15

Inyoung Kim 김인영

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Deepak Olla · Answer 2 · 2019-04-15T10:45:23.257

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Works perfectly fine for me. Please insure that visualisation code is correct. Here is a screenshot of the my code which I ran to test your images. Screenshot of code.

edited Apr 15 '19 at 10:45

answered Apr 15 '19 at 10:27

Deepak Olla

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Please do not post screenshots of code. Copy paste it to you question/answer – Adrian Krupa Apr 15 '19 at 11:01
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I am new here. Will surely keep this in mind. Thanks a lot for your input. – Deepak Olla Apr 15 '19 at 11:07

score 0 · Answer 3 · answered Apr 24 '19 at 09:14

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the problem was in the different line before. The cvtColor works fine

answered Apr 24 '19 at 09:14

Mariia

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How can I properly convert image to gray scale in opencv

3 Answers3