Articles: Sharpening for Print and Web
The Print Sharpening Class
For prints that will blow your mind.
Sharpening for web
The method I've found works best for me.
Understanding Unsharp Mask
The original sharpening method, and still the best.
Noise removal and sharpening – the leap of faith
You won't believe it until you see it.
Remini
Don't trust it.
Topaz Sharpen AI
Putting it to the only test that matters.
High Pass Filter Sharpening
This might be useful occasionally.