I have been working in Photoshop CS5 with this particular image:
What I am trying to do is generate a circle from this, such that the top edge collapses down to a central point and the bottom edge forms the outer radius of the image. How would one go about this, ideally without changing to another piece of software?
Answer
That’s exactly what the Polar Coordinates filter does (Filter → Distort → Polar Coordinates…).
Since you want a circle you’ll need to distort the image in to a square first (otherwise you’ll get an ellipse). The filter will repeat any pixels on the outside edge so you can make your canvas a few pixels taller on the bottom edge so that you get the isolated circle*.
* Otherwise you’ll get something like this:
Attribution
Source : Link , Question Author : Skyler , Answer Author : Cai