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

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?

[Von Duesenberg]

Could you please post your code? It would be easier to help you.

Answer 1

[Guillaume]

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]);