good evng matlab experts .i want to add 2 images of different sizes

 i have an image and i have to extract some defined size of it and i have to perform some image processing and then i have to replace the processed image again in raw image . can any one help me it will be very favourable to me

Answer 1

[Thorsten]

You can extract the subimage S from image I using

ind1 = 100:300; ind2 = 250:500; % sample values
S = I(ind1, ind2, :);

do some operation on S

S = S.^(1/2.3); % gamma correction

and set it back to S

I(ind1, ind2, :) = S;

Voilà!