force an image file to be in landscape mode

No matter what I do in saving an image to a file, the orientation of the file is in portrait mode NOT landscape. This requires me to rotate the image should I need to copy it to a document The following does not work;

% Force image to be saved in landscape mode
    h=gcf;
    set(h,'PaperOrientation','landscape');
    set(h,'PaperUnits','normalized');
    set(h,'PaperPosition', [0 0 1 1]);
    orient landscape
    print(gcf, '-dtiffn', imagefilename);

Answer 1

[Rik]

Do you really need to export it as the result of a figure? Anyway, you can use

imwrite(imrotate(imread(imagefilename),90),imagefilename)

to load, rotate by 90 degrees and write again.