How to reproduce imshow display range [] ?

Hi

having a grayscale image (f.e. "img", 512x512, double), how can one reproduce the scaling that is done by imshow(img, []) and save the result?

From the Mathworks documentation I know that ..."If you specify an empty matrix ([]), imshow uses [min(I(:)) max(I(:))]"...

I tried using imadjust as imadjust(img, [min(img(:))/255, max(img(:))/255], [0, 1]), but this didn't work as it gave a different ouput than the imshow function.

Thanks already in advance!

Answer 1

[Walter Roberson]

mat2gray() rescales between the min and max values. Not the most obvious of routine names.

Since R2017b there has also been rescale()

Answer 2

[Image Analyst]

Why are you using imadjust()? You can just use max and min to save the display range:

displayMin = min(img(:));
displayMax = max(img(:))
% Display img:
imshow(img, []); % Will use [displayMin, displayMax]
% Display image1 using same display range as img.
imshow(image1, [displayMin, displayMax]);
% Display image2 using same display range as img.
imshow(image2, [displayMin, displayMax]);
% etc.