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The pixel values are not all 255 in 256*256 matrix.But I get a white image.How?

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Veera Kalyani S
Veera Kalyani S 2017-1-9
编辑： Guillaume 2017-1-9
A 256*256 matrix consists of pixel values that varies from 1 to 256 randomly.
But the image displayed for the corresponding matrix is a white colored image.
how?

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回答（1 个）

Guillaume
Guillaume 2017-1-9
编辑：Guillaume 2017-1-9
My guess is that you're using
imshow(someimage);
and someimage is of class double. The class of the image matters for imshow. If it is of class double, imshow assumes the range is [0-1], not [0-255]. imshow assumes [0-255] if the image is of class uint8. So, there's two ways to fix this:
  • convert your image to uint8:
someimage = uint8(someimage);
imshow(someimage);
  • or override the default range of imshow:
imshow(someimage, [0 255]);

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