Unless you have all the images in your directory exactly the same size, don't waste your time with any of the extensions from this developer. If your images are the same size then maybe this will work for you. If I am going to point it at a folder full of images, I expect the module to be smart enough to resize all images to resize to a height specified and let the widths flow. Not this module. If your images are different sizes, mine are, I am a photographer, then this will not work for you.
Save yourself the time and look somewhere else.