Nonzero pixels in black image?!

2013 12 25
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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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Walter Roberson
Walter Roberson 2013-12-25
编辑：Walter Roberson 2013-12-25

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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.

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Steven
Steven 2013-12-25
Thanks Walter.
But I forgot to mention that the image is a binary one! So when it is black, all the pixels must be 0, right? but here I have got (exactly!) the last row and column WHITE! Why?
Image Analyst
Image Analyst 2013-12-25
Use imwrite to save your binary image and then post it.
Walter Roberson
Walter Roberson 2013-12-25
What is class() of the data ? If it is not "logical" then there are non-zero values that are dark.

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