Problem with imhist after modify image

Hello, Why After histogram in 0 to 1 range?

I=imread('cameraman.tif');
figure
subplot(2,2,1);
imshow(I);
title('Original');
subplot(2,2,2);
imhist(I);
title('Original Histogram');
I=double(I);
fis=readfis('FIS4');
[m  n]=size(I);
for  i=1:m
     for  j=1:n
         I(i,j)=evalfis(I(i,j),fis);
     end
end
subplot(2,2,3);
imshow(uint8(I));
title('After');
subplot(2,2,4);
imhist(I);
title('After Histogram');

[Zahra Saman]

Plz help me to remove this error pleasw

Answer 1

[Ahmet Cecen]

For now use:

 imhist(uint8(I))

That will get your work done, although it puzzles me why that is necessary, because imhist normally accepts double.

[Dani D]

I use uint8(I) for imshow,not imhist

[Ahmet Cecen]

... and I am telling you to use it for imhist as well, it will make it work...

[rjvyas]

I had the same problem and using imhist(uint8(I)) worked! Thank you

[Image Analyst]

You can also use histogram:

histogram(I);

which doesn't require conversion to integer.

Answer 2

[Julie]

It changed the range, sometimes it does grayscale in 0-255, and sometimes it does it in 0-1. It won't make a difference to your image. To fix your histogram use

imhist(I.*255);

[Dani D]

Thanks and i use it but don't effect.

[Zahra Saman]

please help me in this problem

[Zahra Saman]

please help me in this problem