Change site title area to custom logo
When you enable the site title it's 150x164 and makes the header area taller.
But I can't seem to get my logo bigger than 91x50.
I don't need the site title, I just want my logo but I want it to be bigger and clearer - at least as big as the site title - cos the title is in the logo.
How can I make the logo bigger, and can I play with the dimensions to get it to the size I want?