I'm guessing you mean in Photoshop so you would
1. click the ruler tool
2. drag it along the line you know is straight
3. on the options bar, click straighten
hope this helps :)
Explanation: The three-finger G, open-string guitar chord: 6th string: Use the 2nd finger to play the 3rd; 5th string: Use the 1st finger to play the 2nd fret. 4th string: Play open. 3rd string: Play open. 2nd string: Play open. 1st string: Use the 3rd finger to play the 3rd fret. The three-finger C, open-string guitar chord: 6th string
I think it is the 3rd dimension
Answer:
nothing I think it looks amazing