After my first attempt with GIMP I spoke to my geeky brother who recommended Paint.net also free but more user friendly – apparently… turns out for what I needed to do I had to download a ‘plugin’ called ‘photo fill’ found here http://forums.getpaint.net/index.php?/topic/28488-boltbaits-plugin-pack-for-v40-updated-february-5-2015/ Once I did that it was easy sailing!
Again if you want to use the paper feel free.