Whether the RGB image which has been transformed into the Grayscale still have a 3D matrix?

excuse me, i want to ask, i have saved grayscale images before, but why that still have 3D matrix and not 2D matrix although the image has been my saved as grayscale? because I intend to creating the image matrix X using grayscale image still need to use permute and tell permute that i want to transpose the 1st and 2nd dimension

Answer 1

[Geoff Hayes]

Alvindra - how are you creating the grayscale image? Which function are you using to do this conversion from RGB?

If you are expecting or need a 2D image, then just convert the 3D into one. For example, if gsImage is your grayscale image then

 if ndims(gsImage) == 3
    % covert the 3D into a 2D image
    gsImage = gsImage(:,:,1);
 end

The above assumes that gsImage(:,:,1) is identical to gsImage(:,:,2) and to gsImage(:,:,3).

[Alvindra Pratama]

i creating grayscale using rgb2gray, and then i saved it into .tif format. Thank you so much sir