Gallery element large image

Dear Kriesi,

I am using the Gallery element with the following settings:
Big image with thumbnails below
No Scaling
No, do not force the same size

When the first image in the sequence is a horizontal format, the big preview images display nicely to fit the width of my 2/3 width column, and any subsequent vertical images display nicely within the same height as the first horizontal image.

But when the first image in the sequence is a vertical image, the big preview image displays much too large, with the vertical image filling the same width and therefore much too tall to fit on screen.

How can I change the gallery behaviour, so that if the first image is vertical it also fits within the smaller height, so that the height of vertical images fits within a certain maximum height?

Thanks, Richard