There are two ways to make a background transparent in Photoshop: using the "Remove Background" quick action or manually by using selection tools.
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How to mirror an image in Photoshop

There are always a number of ways to do anything in Photoshop. Something as simple as mirroring an image can be done through ...
You can easily flip an image in Photoshop to mirror any photo with a simple edit. Here's how to do it.