Watch Readout in Firebug or other Inspectors while re-sizing blocks in Headway
Channel: Creator's Media Tools
Date: 2012-02-27

http://terrybritton.com For the header block, to get the right size of image that fits your block correctly, you have to size the block to the size you want, then you can make the image re-size to the block in the heading block config - though I personally feel is is much less struggle to simply find the dimensions of your block first and then create a graphic of the right size to fit that.

At this time, it can be tricky, as you have to size the block by dragging, and there is not currently any direct feedback as to the dimensions you are at other than using Firebug or similar to watch the dimensions as you pull the sides.

 Here is a video showing how I'm reading off the size of the block AS I drag it using Firebug, but other inspectors can do similarly in other browsers.