Unsharp Mask is a classic tool of general use that acts on sharpening by reinforcing the contours present in the image. It can be used for any image, and in particular for those resulting from camera + lens combinations not characterized by the DxO.

The Lens sharpness is a tool specific to DxO and one of its strong competences. It is only available for camera + lens characterized combinations. This tool should be privileged because it is supposed to bring the right improvement.

The corrections of these two tools should not be combined
– If there is a lens module, DxO activates (with the preset 1- DxO Standard) the Lens Sharpness and deactivates the Unsharp Mask 
– If there is no module, only Unsharp Mask is available

* Please mind. The effect of these settings is visible in the preview only with a zoom value at least of 75% (preferably 100%).
* Use both tools together should be limited to very rare cases. Like adding, as a last step before printing, a slight Unsharp Mask accentuation adapted to the dimensions of the print.
* Direct JPEGs from cameras are usually enhanced. It is generally not necessary or desirable to add more, at the risk of caricatured artifacts.

Lens Sharpness

– Global: The target value (0) of the sharpening defined by DxO for this lens.
Use a negative value usually in portrait, a positive value can be useful for a landscape for example
– Details: This slider corresponds to the size of the influence radius. 
It acts on the finest details of the image. It can be decreased for a portrait, and increased for a landscape
– Bokeh: (raw only) This slider allows you to limit the emphasis of the blurred background and avoid possible artifacts.

* The algorithm action is restrained for medium quality optics, and the selected target sharpness is higher on consumer cameras.
* The riskof changing these values is to obtain an unsightly and unwanted sharpness effect in the areas outside the depth of field.
* Pushing the sliders too far can generate artifacts.

Click to enlarge – Alt+ < to return

More informations on the DxO blog

Unsharp Mask

These starting values are a good starting point:

Intensity = 100 can set up to 200. Lower values can be used to soften, instead of sharpen an image.
Radius = 0.5 (value in pixels). It acts on the finesse of the accent by adjusting the thickness on both sides of the contours considered. Over-tuning causes halos to form on the contours.
Threshold = 4. It should stay within a range from 4 to 10. It fixes the boundary of the effect of the correction. This makes it possible  to avoid sharpening the smallest details that look just like noise.
Edge offset (specific setting for DxO) lets you homogenize the sharpness between the center and the edges of an image.

It is recommended to create a partial preset, e.g: “0 PARTIAL – Laowa 7.5” usable for photos taken under the same conditions. 

Other settings contributing to the sharpness

The application of calibrated corrections (including these two features) is located early in the process chain, before more creative corrections such as fine contrast, so that measured calibration data can be applied in a meaningful way.

All corrections are linked. For example, the Lens sharpness correction influences the application of the noise reduction.

In addition to these two sharpness settings, the MicroContrast and Fine Contrast settings should be used for “creative” image enhancement. 

It is possible to make local adjustments to sharpness and blur in Local Settings.

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