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why am I getting an error for this tutorial when adapted to my image? how can I fix this error:

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clc; % Clear command window.
clear; % Delete all variables.
close all; % Close all figure windows except those created by imtool.
% imtool close all; % Close all figure windows created by imtool.
workspace; % Make sure the workspace panel is showing.
lab_fabric = rgb2lab('image.tif');
a = lab_fabric(:,:,2);
b = lab_fabric(:,:,3);
color_markers = zeros([nColors, 2]);
for count = 1:nColors
color_markers(count,1) = mean2(a(sample_regions(:,:,count)));
color_markers(count,2) = mean2(b(sample_regions(:,:,count)));
color_labels = 0:nColors-1;
a = double(a);
b = double(b);
distance = zeros([size(a), nColors]);
for count = 1:nColors
distance(:,:,count) = ( (a - color_markers(count,1)).^2 + ...
(b - color_markers(count,2)).^2 ).^0.5;
[~,label] = min(distance,[],3);
label = color_labels(label);
clear distance;
rgb_label = repmat(label,[1 1 3]);
segmented_images = zeros([size(fabric), nColors],'uint8');
for count = 1:nColors
color = fabric;
color(rgb_label ~= color_labels(count)) = 0;
segmented_images(:,:,:,count) = color;
montage({segmented_images(:,:,:,2),segmented_images(:,:,:,3) ...
segmented_images(:,:,:,4),segmented_images(:,:,:,5) ...
title("Montage of Red, Green, Purple, Magenta, and Yellow Objects, and Background")
Error using rgb2lab
Expected input number 1, RGB, to be one of these types:
single, double, uint8, uint16
Error in rgb2lab (line 56)
validateattributes(rgb, ...
Error in test (line 7)
lab_fabric = rgb2lab('image.tif');

Accepted Answer

Karim on 26 Dec 2022
Then you forgot to import the image, start with the imread function to read the image and then call rgb2lab
fabric = imread('fabric.png');
lab_fabric = rgb2lab(fabric);
  1 Comment
Walter Roberson
Walter Roberson on 26 Dec 2022
Very few image related functions accept file names. imread() does if course, and imshow() does as well. I seem to recall that one of the image montage functions accepts file names. Some of the image information functions as well. But for anything other than imread you should always check the documentation to be sure that it accepts file names. It is safer to assume that most functions require that you pass in image data rather than file names.

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