Data not appearing in image

I have a 2400x2400 matrix that I would like to display as an image. When I do image(MyMatrix), the resulting image is just blue (no data visible). Just to test, when I do imagesc(MyMatrix), some of the data becomes visible. How might I be able to make all of my data appear in the image?

Answer 1

[Sean de Wolski]

imshow(matrix,[]); %Use [] to show whole data range

[Image Analyst]

If it was blue, it must have either had a non-gray colormap applied, or it was an RGB image, not a gray scale image, or she really used imagesc() instead of image(). If it was really a 2400x2400x3 RGB color image, and is floating point (single or double) then [] won't work (like it does for monochrome images for some reason - I've notified Mathworks) and you'd have to cast it to integer (uint8). If it's gray scale, then Sean's method will work (unless you have some bizarre colormap applied). But it it were grayscale I don't know why it showed up as blue.