I am getting Subscripted assignment dimension mismatch in the following code

I am getting Subscripted assignment dimension mismatch error in the following code:

Error in (line 18) ntscIm(:,:,1)=sgI(:,:,1);

Can you help me please, how can I fix this?

g_name='example.bmp';
c_name='example_marked.bmp';
out_name='example_out.bmp';

%
%
solver=2; 

gI=double(imread(g_name))/255;
cI=double(imread(c_name))/255;
colorIm=(sum(abs(gI-cI),3)>0.01);
colorIm=double(colorIm);

sgI=rgb2ntsc(gI);
scI=rgb2ntsc(cI);

ntscIm(:,:,1)=sgI(:,:,1);
ntscIm(:,:,2)=scI(:,:,2);
ntscIm(:,:,3)=scI(:,:,3);

Answer 1

[Boris]

∫Found out myself:

A = sgI(:,:,1);
B = scI(:,:,2);
C = scI(:,:,3);

[m,n,l] = size(A);
[m1,n1,l1] = size(B);
[m2,n2,l2] = size(C);

ntscIm(1:m,1:n,1) = A;
ntscIm(1:m1,1:n1,2) = B;
ntscIm(1:m2,1:n2,3) = C;

is the correct solution. and it works!!!! :))))

Answer 2

[Walter Roberson]

Are you looping over this sequence? So ntscIm might already have a value from the last time through the loop? And that value might happen to be a different array size?

[Boris]

Found out myself. First hours in studying MATLAB :)