Tutorial 1- Dual view in ps

It allows you to view 2 same picture, edit however you want to each picture but the effect applies to both. For example, the first picture you zoom in and brighten certain parts, while the second picture remain its original view size (or you can zoom in or out to your liking) but the effect of brightening from the first picture still taken place to the second picture. Or something like this



So, firstly ready your picture



Next go to Window > Arrange > New Window for ...



Then you have something like this. 2 same picture



Next go to Window > Arrange > Tile



Now you have something like below.



It helps you to see the changes you make without you having to zoom in and out all the time.You get the idea.



Done first tutorial. Kthxbye