This tutorial ( which includes a video ) shows you how to change the header image size for the logo in the Enterprise Pro child theme by
Enterprise Pro Theme Tutorials
The tutorials in this archive contain code which enables you to modify existing functionality and styling in the Enterprise Pro child theme by StudioPress. The tutorials also enable you to add custom functionality and styling to this theme. The code is guaranteed to work as shown in the demo images and videos. Installation of all code as well as support for PHP code is provided for members.