showing the grayscale matrix

I have a 2D matrix , and I was trying to display it as an image, but the problem is that in the output axes, for all the numbers except 0, I see white in result, and black for zero, I want to see all gray colors (in grayscale) from black to white, what can I do? this is the resault I see

Answer 1

[Image Analyst]

It's probably a type double, which needs to be in the range 0-1, not 0-255 that you probably have. You can autoscale with []. Try

imshow(your2Dmatrix, []);

[evangeline]

thanks, it worked. can I use this for a 3D matrix too? because I have the same problem with that

[Image Analyst]

You can use it to display a 2D slice from a 3D image.