Ok, I read the support docs. on how to use this feature for custom header.
I use Twenty Twelve theme. I looked at the settings and couldn't figure out how to take advantage of a vertically longer (a bit) header and keeping the 1000 width.
Looks I have to delete present and upload to see the setting where I don't need to crop a header's height before I upload?
The blog I need help with is cyclewriteblog.wordpress.com.