Crop Circular Fisheye Photo

Well that was a disappointment.  I opened this thread expecting to see something like this. 

I suppose that on the day that the despicable WorldNetDaily conspiracy site bites the dust (and good riddance) it was too much to hope for irrefutable proof that aliens like to doodle on our planet's corn fields.    On a more serious note, do people think that said aliens used vector or raster apps to make their circles?  And is outer space on the eligibility list for Creative Cloud subscriptions?

Well who'd have thought!?

Use the Elliptical Marquee tool. Hold down the Shift and drag diagonally. Don't worry about the exact fit.

Choose Select > Transform Selection and use the handles to change circle size and position the marching ants.

NOTE: With the latest version of Photoshop the circle will hold proportion without holding down the shift key.

When you are satisfied with the Selection, cmd+J will put the circular image on a new transparent layer.

EDIT:  You probably took several photographs. Consider this: After making the selection, choose Select > Save Selection. It will be saved and seen in the Channels panel and can be called upon to function as a Selection or a Mask on other images.

Photoshop images are always rectangles. Do you want the area outside of the circle to be a solid colour or transparent?

Use the elliptical marquee tool to select the circle and invert selection.

Then either fill the selected area on a new layer or add a mask to the existing layer to hide the selection (note if your existing image is a background layer click the lock symbol first to turn it to layer 0 so you can use transparency)

Note - If using transparency you will need to save/export to a format that supports transparency i.e PSD/TIFF/PNG not jpeg

Dave