why i get this error

i=imread('leaf_Pic_small.jpg');
s=imadjust(i,stretchlim(i,[0.05 0.95]),[]);
subplot(2,2,1), imshow(i), title('original');
subplot(2,2,2), imshow(s), title('stretched');
subplot(2,2,3), imhist(i), title('histogram of original img');
subplot(2,2,4), imhist(s), title('hist of stretched img');

>> leafproj

Error using imhist

Expected input number 1, I or X, to be two-dimensional.

Error in imhist>parse_inputs (line 278)

validateattributes(a,

{'double','uint8','int8','logical','uint16','int16','single','uint32',

'int32'}, ...

Error in imhist (line 60)

[a, n, isScaled, top, map] = parse_inputs(varargin{:});

Error in leafproj (line 5)

subplot(2,2,3), imhist(i), title('histogram of original img');

Answer 1

[KSSV]

Your image seems to be a RGB image. You have to use imhist on a 2D matrix. Not 3D image.

R = i(:,:,1) ;
G = i(:,:,2) ;
B = i(:,:,3) ;
figure
imhist(R)
figure
imhist(B)
figure
imhist(G)