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Error , find entropy of 3d volumetric image on GLCM features ?

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I will find GLCM feature. But error follow as:
b=niftiread("D:\DATASET\Task01_BrainTumour\imagesTr\BRATS_001.nii");
b1=b(:,:,:,1);
cmap = copper(256);
recolored_image = rgb2gray(b1, cmap);
error as following;
Error using rgb2gray
Too many input arguments.

Answers (2)

Walter Roberson
Walter Roberson on 25 Aug 2022
rgb2gray() has never supported more than one input, and has never supported recoloring images.
rgb2ind supports passing in a colormap. You could recolor an image by using
ind = rgb2ind(b1, cmap);
recolored_image = ind2rgb(ind, cmap);

Abderrahim. B
Abderrahim. B on 25 Aug 2022
Hi!
b1 is not truecolor image that is a m-by-n-by-3 numeric array. b1 in your case is a m by n by l by 1 (4 D array). use reshape to deal with this.
Hope this helps
  4 Comments
Hla Hla
Hla Hla on 25 Aug 2022
Edited: Walter Roberson on 28 Aug 2022
Dear sayar, i run above the code.
ind = rgb2ind(b1, cmap);
recolored_image = ind2rgb(ind, cmap);
Error occupy followas:
Error using rgb2ind>parse_inputs (line 145)
RGB image has to be M-by-N-by-3 array.
Error in rgb2ind (line 53)
[RGB,m,dith] = parse_inputs(varargin{:});

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