how to make two matrices multiplicable in matlab

let say i have an image of some dimension and a 3x3 matrix which i want to multiply with all its pixels but how can i achieve it. Rows and cols are not equal?

Answer 1

[Star Strider]

You can see if the convn function does what you want. For this, your image has to be in double-precision, so use the double function on it first.

Esample:

Img = randi([0  255], 40, 50, 3);
K33 = rand(3);

Out = convn( Img, K33, 'same');

figure(1)
subplot(1,2,1)
imshow(uint8(Img))
subplot(1,2,2)
imshow(uint8(Out))

[Muneef]

still getting it ??? Error using ==> times Matrix dimensions must agree.

[Walter Roberson]

Is your image 2D (grayscale, black and white) or 3D (RGB) ? If it is 2D then you would use conv2() instead of convn()