How to cut an image by pixels without imcrop?

I would like to crop the image from (1,1) to (340,562) using a "while" function. This is the code I have so far

c = I2(:,1);
d = I2(1,:);
while c <= 562
c = c+1 
I3 = 
while d <= 340
d = d+1
I3 = 
end
end

I don't know what to put in the I3= parts to crop the image if the pixel coordinates satisfy those conditions. Also I can't use imcrop since this is an assignment and it was specified to be completed this way.

Answer 1

[Image Analyst]

Initialize c and d to 1, then

c = 1;
I3 = zeros(340, 562);  % Preallocate for speed.
while c <= 562
   d = 1;
   while d <= 340
        I3(d, c) = I2(d, c);
....
....
    c = c+1 
....

and so on. See if you can fill in the missing lines for your homework. It's pretty close - just 3 more lines of code.

[Megan Wang]

Thanks so much!