OK..so I was bored this afternoon and I thought I would make something that I will use and maybe will be useful for other folks too.
I noticed that You Tube changed. The most striking thing is the channel art that can be optimized to be viewed on all kinds of screens from TV sets downwards. Thing is, though, you need to be careful when you make your channel art as not all of the image will be visible for all devices.
This is the example You Tube give:
That is kind of helpful, but I wanted a quick way of keeping things right in Photoshop (or Gimp) without having to setup lines and rulers all the time. So I made this...