Does My Image Need Sharpening?

If your image appears reasonably sharp when viewed at Actual Pixels zoom level on your display, and your intended output is something other than to the display at the size you're viewing, your image needs sharpening.

Of course, if your image appears soft at Actual Pixels zoom level on the display, it needs sharpening no matter what the final use. But one of the harshest sharpening lessons I've learned is that it's extremely difficult to make judgments about output sharpening by looking at pixels on the monitor.