I use a program called GIMP which is a free photoshop type app for the Mac, and the best thing is that it is free - http://www.gimp.org/macintosh/ Let me know how you go!
Thanks
I need a circuit where when a input is 1 it will give an output of 1 but then if the input then returns to 0 the circuit will not go to 1 until another separate input goes to 1.
I hope that makes any sense, hard to visualise but hopefully if you're in the know with electronics you can point me...