I am the owner of MacBook AIR 11 and need to print a scan document- some A4 sketches. I need reach the higher quality as possible. For that I need to print this sketches in black and white (the grey levels)- to set this colour option could be the solution, but when I am using photoshop I cannot find there option where I could set this. And in Preferences-> printer I cannot find some default setting as well. So can you give me advice how to set dafaultly to print in black and white? (printer: hp photosmar c4580) thank you a lot!