How to fix this error if my image is not two dimensional?

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handclah = imread('hand2.jpg');
handclahe = adapthisteq(handclah, 'clipLimit', 0.02, 'Distribution', 'rayleigh');
figure, imshow (handclah);
figure, imshow (handclahe);
The error is shown below:
Error using adapthisteq
Expected input number 1, I, to be two-dimensional.
Error in adapthisteq>parseInputs (line 416)
validateattributes(I, {'uint8', 'uint16', 'double', 'int16', 'single'}, ...
Error in adapthisteq (line 155)
noPadRect, distribution, alpha, int16ClassChange] = parseInputs(varargin{:});

Accepted Answer

Image Analyst
Image Analyst on 23 Nov 2021
You're using it on a color image and you can't do that. It needs a gray scale image. To fix:
handclah = imread('hand2.jpg');
[rows, columns, numberOfColorChannels] = size(handclah)
if numberOfColorChannels == 3
% If it's color, convert it to gray scale.
handclah = rgb2gray(handclah);
end
handclahe = adapthisteq(handclah, 'clipLimit', 0.02, 'Distribution', 'rayleigh');
subplot(2, 1, 1);
imshow (handclah);
subplot(2, 1, 2);
imshow (handclahe);
  5 Comments
Image Analyst
Image Analyst on 25 Nov 2021
That will solve the error you had, so could you click the "Accept this answer" link for my Answer? Thanks in advance.

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More Answers (1)

Yusuf Suer Erdem
Yusuf Suer Erdem on 23 Nov 2021
Hello, I used these codes below and it worked for me. Could you try it too? I only used .tif format image instead of .jpg image. I upload my image for you too.
clc; clear; close all;
I = imread('tire.tif');
J = adapthisteq(I,'clipLimit',0.02,'Distribution','rayleigh');
imshowpair(I,J,'montage');
title('Original Image (left) and Contrast Enhanced Image (right)')

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