Incorrect Dimension of matrix multiplication Where I= 178*284 T =8*8, how to make the I compatible to T, If multiplication is done element wise

I = imread('Published\SAMPLE1.jfif');

figure();

imshow(I);

%display(I);

I = rgb2gray(I);

figure();

imshow(I);

I = im2double(I);

title("Vein Image");

n = input("enter the basis matrix dimension: ");

T= dctmtx(n);

disp(T);

dct1 = @(block_struct) T * block_struct.data * T';

B = blockproc(I,[n n],dct1);

I1 = imresize(I,0.90);

display(B);

figure();

imshow(B);

invdct = @(block_struct) T' * block_struct.data * T;

I2 = blockproc(B,[8 8],invdct);

figure();

imshow(I2);

title("Image");

[Stephen23]

@Divya: what is the expected size of the output array?

[Divya]

same dimension as input image