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Why am I getting black image while writing LAB space images to a directory?

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0

I am trying to find the redness of skin disease called rosacea.

Here is the original image.

So I convert RGB image to LAB color space.

lab_image = cv2.cvtColor(x, cv2.COLOR_RGB2LAB)

Now on displaying it, I get the LAB colour of the image:

Now I want to save all this information as a jpeg file to a directory. so I use the following command.

cv2.imwrite('new.jpg',lab_image)

But I get a black image, like this:

How can I save that LAB blue coloured information as a jpeg file in Python?

python opencv image-processing image-conversion

share|improve this question

edited Mar 22 at 11:20

user10573543

asked Mar 22 at 9:25

user10573543user10573543

387

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Could be related: Unexpected output while converting RGB image to LAB image
  
  – Georgy
  Mar 22 at 9:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Try printing lab_image[:,:,0].mean() to see the mean Hue, then lab_image[:,:,2].mean() to see the mean Lightness in order to check the averages are in range 0..255.
  
  – Mark Setchell
  Mar 22 at 10:07
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  the Mean hue is 4.8895955. the Mean lightness is -3.6559463.
  
  – user10573543
  Mar 22 at 10:44
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @GeorgyThanks for the suggesting link but it did not help. The hard way would be to screenshot the lab converted images when viewing them.
  
  – user10573543
  Mar 22 at 10:46
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @MarkSetchell I want to save the lab image in the jpg format, so the jpg image (rpg) will show all the blue colour and everything. Is there a method for that.
  
  – user10573543
  Mar 22 at 10:47
  

  
  
  
  

 | 
show 3 more comments

0

I am trying to find the redness of skin disease called rosacea.

Here is the original image.

So I convert RGB image to LAB color space.

lab_image = cv2.cvtColor(x, cv2.COLOR_RGB2LAB)

Now on displaying it, I get the LAB colour of the image:

Now I want to save all this information as a jpeg file to a directory. so I use the following command.

cv2.imwrite('new.jpg',lab_image)

But I get a black image, like this:

How can I save that LAB blue coloured information as a jpeg file in Python?

python opencv image-processing image-conversion

share|improve this question

edited Mar 22 at 11:20

user10573543

asked Mar 22 at 9:25

user10573543user10573543

387

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Could be related: Unexpected output while converting RGB image to LAB image
  
  – Georgy
  Mar 22 at 9:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Try printing lab_image[:,:,0].mean() to see the mean Hue, then lab_image[:,:,2].mean() to see the mean Lightness in order to check the averages are in range 0..255.
  
  – Mark Setchell
  Mar 22 at 10:07
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  the Mean hue is 4.8895955. the Mean lightness is -3.6559463.
  
  – user10573543
  Mar 22 at 10:44
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @GeorgyThanks for the suggesting link but it did not help. The hard way would be to screenshot the lab converted images when viewing them.
  
  – user10573543
  Mar 22 at 10:46
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @MarkSetchell I want to save the lab image in the jpg format, so the jpg image (rpg) will show all the blue colour and everything. Is there a method for that.
  
  – user10573543
  Mar 22 at 10:47
  

  
  
  
  

 | 
show 3 more comments

I am trying to find the redness of skin disease called rosacea.

Here is the original image.

So I convert RGB image to LAB color space.

lab_image = cv2.cvtColor(x, cv2.COLOR_RGB2LAB)

Now on displaying it, I get the LAB colour of the image:

Now I want to save all this information as a jpeg file to a directory. so I use the following command.

cv2.imwrite('new.jpg',lab_image)

But I get a black image, like this:

How can I save that LAB blue coloured information as a jpeg file in Python?

python opencv image-processing image-conversion

share|improve this question

edited Mar 22 at 11:20

user10573543

asked Mar 22 at 9:25

user10573543user10573543

387

lab_image = cv2.cvtColor(x, cv2.COLOR_RGB2LAB)

cv2.imwrite('new.jpg',lab_image)

share|improve this question

edited Mar 22 at 11:20

user10573543

asked Mar 22 at 9:25

user10573543user10573543

387

share|improve this question

edited Mar 22 at 11:20

user10573543

asked Mar 22 at 9:25

user10573543user10573543

387

asked Mar 22 at 9:25

user10573543user10573543

387

asked Mar 22 at 9:25

user10573543user10573543

387