> For the complete documentation index, see [llms.txt](https://docs.cloudimage.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cloudimage.io/transformations/image-filters/sharpen.md).
# Sharpen
Unsharp mask
Sharpening is a powerful tool to emphasize texture and details, especially on smaller images, e.g. thumbnails. Cloudimage 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 |
| -------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
|  | Only resize:
/samples.scaleflex.com/darkside.jpg?w=300
|
|  | Resize and sharpen:
/samples.scaleflex.com/darkside.jpg?w=300&sharp=3
|
