Given a square image, how can I crop, at the exact center, of the image?

What if the image is not square itself?

What if I'm using Photoshop CS6 or some older version? 
Is the procedure the same?


Question: Electric Violin care
Answer: What you should look for is a well built instrument, with good sound and that looks and sounds good for you.

If you are inexperienced can be good to take someone with you that is more advanced in violin playing. Anyway you can think about this:


Some electric violins are very heavy, this will hurt your back. Wood violins weight about 0,5 Kg
Check if the overtones are tuned. If the empty strings are tuned then the overtones should also be, otherwise it might be strange proportions in the instrument which will give you problems with intonation.
Try the sound. You have to like the sound of the instrument. Ask also what kind of pickup it has and check the cable exit is comfortable with your way of holding the violin.
Some instruments have nice electronics, like volume knobs and eq, this can be good but not essential. More features more weight and higher price.
Some E.Violin needs a battery inside. In that case you need to change it as a part of the maintenance, and have a spare battery around. Big advantage to violins with batter is that often you can play them with headphones anywhere without needing more power.


The maintenance is very much the same, more simple actually. Cleaning rosin from your strings is one good habit to have.