MATLAB: Are all grayscale images of the size 256*256. Please clarify

grayscaleimage analysisimage processingsize;

I am using a .png image for processing. I converted it to grayscale and the value shown for the image is 289×318 uint8.. When I used [r c d]= size(I), I got r= 289, c=318 and d=1. Does it mean that my image has been grayscaled or not? And what does size 256*256 mean? Does it signify the values inside the matrix?

Best Answer

The size of your image is 289 x 318, as returned by the size command. Why do you think that the size is 256*256? A grayscale image can be of any size, only some of them are of size 256 x 256. The range of values are from 0 to 255, for a uint8 type image, so each pixel can take one from 256 different values. But that's the value of a pixel and has nothing to do with the size.

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Try this to create a grayscale image:

whiteImage = 255 * ones(N, M, 'uint8');
imshow(whiteImage);

To create an RGB image, try this:

whiteImage = 255 * ones(480, 640, 3, 'uint8');
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Let A,B,C,D be your respective coefficients (Ax^3+Bx^2+Cx+D=0) of size 256*256..

R = zeros(n,n,3) ;  % roots initialized 
for i = 1:n
    for j = 1:n
        p = [A(i,j) B(i,j) C(i,j) D(i,j)] ;
        r = roots(p) ;
        R(i,j,:) = r ;
    end
end

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