Scale Image to fit in width or leave unscaled

[Paul Baumer <paul.baumer2@gmail.com>]

Hello,

I would like to achieve the following image resizing as a general rule in my docbook5. I generate the docbook myself using python. And finally I generate pdf from the docbook.

if image width will not fit the page

   it shall be resized to fit in width

else

   image size shall be left unchanged

I am aware of the scalefit, scale, width and content width. But I am having difficulty in using a combination of those to achieve the desired logic above.

Paul