Nonzero pixels in black image?!
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Steven
on 25 Dec 2013
Commented: Walter Roberson
on 25 Dec 2013
In an image process, I have got an image which after being inverted (to calculate the perimeter), it becomes absolutely black on screen. But when I see the pixel values, the last row and column are not zero!
why?
I mean when you sum the pixels, it is not zero!, while the image is completely black!
Thanks!
Steven
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Accepted Answer
Walter Roberson
on 25 Dec 2013
Edited: Walter Roberson
on 25 Dec 2013
Your display is not set up to display a color that dark notably differently than true black. This is proper behaviour. Remember, a pixel value of 1 (out of 255) is not very bright.
3 Comments
Walter Roberson
on 25 Dec 2013
What is class() of the data ? If it is not "logical" then there are non-zero values that are dark.
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