Photoshop Tip: Nudge selections pixel by pixel
Tips & Tutorials, by Mark White
June 5, 2012
When you make a selection using the Marquee tools it can often be difficult to get the selection in the right place
Use the arrow keys to nudge a selection one pixel at a time, and this can be increased to ten pixels by holding Shift.
Hold the Space bar while drawing out a selection to move it to a new location.