I have a world imagery layer that I want to clip to a single county. I would just save as a JPEG and edit using other software, but this uses a lot of processing power if I want a high resolution. I would like to clip the image before exporting to JPEG. Is this possible?
To clip the Image layer, you firstly need a polygon feature class of your area of Interest.
Once You have the data, you can 'clip' the Raster Data using Extract By Mask. This would require a Spatial Analyst License. and would give you a raster containing the data inside your polygon.
If you require a Rectangular image, centered on your Area of Interest, you could use Extract By Rectangle.
You can use processing tool in ArcMap to clip layer, Processing menu -> clip here clip https://www.youtube.com/watch?v=hEE9leOvtto