What does the radius control?

Radius sets the blur scale used to build the detail mask. Smaller values target narrower features, while larger values affect broader structures.

What does the amount control?

Amount scales the difference between the source and blurred image before that difference is added back.

What does the threshold control?

Threshold sets the minimum local difference required for sharpening, which can reduce changes in low-contrast regions.

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Unsharp masking subtracts a Gaussian-blurred copy from the original to expose edges, scales that difference with the amount control, and adds it back. The radius sets the blur scale, while the threshold can limit sharpening in low-contrast regions.

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Unsharp Mask

Unsharp masking subtracts a Gaussian-blurred copy from the source to isolate local detail, scales that difference with the amount control, and adds it back. The threshold control can exclude lower-contrast differences from sharpening.

Available Controls

Radius: 0.5 to 20 pixels
Amount: multiplier from 0.5 to 3.0
Threshold: local contrast cutoff from 0 to 50
Output format: PNG or JPG

How to Use Unsharp Mask

Select an image — Choose the JPG, PNG, or WebP image to sharpen.
Set sharpening controls — Adjust radius, amount, and threshold while comparing the preview.
Review and download — Process the selected settings and save the generated PNG or JPG.

Frequently Asked Questions

What does the radius control?: Radius sets the blur scale used to build the detail mask. Smaller values target narrower features, while larger values affect broader structures.
What does the amount control?: Amount scales the difference between the source and blurred image before that difference is added back.
What does the threshold control?: Threshold sets the minimum local difference required for sharpening, which can reduce changes in low-contrast regions.

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