The Photoshop Find Edges Sharpening Tutorial when done correctly it will give you very sharp edges without effecting the rest of the image. Works really great on photos with clean lines such as architecture. 

Tutorial Overview

– Photoshop's Find Edges Filter
– Channel Masks
– Layer Masks

Useful Hotkeys

Duplicate Layer – Ctrl (Command) + j
Invert Layer Mask – Ctrl (Command) + i

Software Used
Adobe Photoshop CS6

Photoshop (Find Edges Filter) Sharpening Tutorial

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