I just added that. It allowed me to make the image taller, but it also defined .site-header to be that tall as well. I just want a larger background image to cover the header area. I don’t want the header to expand with the image. DT_HEADER_WIDTH did not work, of course.
I know I can add CSS to make .site-header the right size again, but I’m just fighting against a bad design. The width is still not right. You need to allow people to upload an image that will cover the header area. My 6 year old, 15″ laptop screen is 1920px wide. 1600px is not wide enough.