MATLAB: Rgb2gray function is giving following error even though i have it in image processing toolbox.

image processing

Best Answer

Rename your script gray.m to something else. gray is the name of a colormap, which is being used by imshow(); the routine you named gray.m is interfering with that.

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MATLAB: Rgb2gray error

Convert to gray scale:

Filelist= dir('Clipboard*.png');
numberOfFiles = length(Filelist);
for k = 1 : numberOfFiles % Don't use i (the imaginary variable).
    thisImage = imread(Filelist(k).name);
    [rows, columns, numberOfColorChannels] = size(thisImage);
    if k == 1
        % Instantiate I with the size of the first image.
        I = zeros(rows, columns, numberOfFiles, class(thisImage));
    end
    if numberOfColorChannels > 1
        % It's color.  Need to convert to gray scale before putting it into the 3D image as the k'th slice.
        I(:,:, k) = rgb2gray(thisImage);
    else
        % Already grayscale.  No need to convert.  Just put in directly as the k'th slice.
        I(:,:, k) = thisImage;
    end
end

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