MATLAB: Set image aspect ratio using imshow

aspect ratioimage

I am trying to load an image (screenshot of a graph), and plot my data on top. I have achieved this, but the aspect ratio of the displayed image/graph doesn't look to be adjustable. Can it be done?
% Load cleaned up screen shot.
load image.mat
% Observe aspect ratio.
imshow(I)
% Flip matrix so that y axis origin is at the bottom instead of the top.
I = flipud(I);
% Scale image to allow plotting on top - this works, but changes the aspect ratio.
RI = imref2d(size(I));
RI.XWorldLimits = [1970 2020];
RI.YWorldLimits = [320 410];
figure;
imshow(I,RI);
set(gca,'YDir','normal');

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doc daspect
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