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Sharpen

Unsharp mask
Sharpening is a powerful tool to emphasise texture and details, especially on smaller images, e.g. thumbnails. Filerobot can apply an unsharp mask filter which will make your image look sharper. You can specify the filter radius (X) in pixels.
sharp=X

Examples

Preview
Syntax
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Only resize: /docs/darkside.jpg?w=300​
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Resize and sharpen: /docs/darkside.jpg?w=300&sharp=3​
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