Adjusting sharpening in the Sharpening tool

As a part of the capture sharpening stage, Capture One applies pre-sharpening to images based on the camera model. The default settings are a good place to start when enhancing an image. Note, of course, that adjustments are global and override the default settings. To alter the sharpening parameters using the keyboard as a shortcut, click on the values to highlight the box, then use the up/down arrows to increase/decrease the values by a set amount. To increase by a larger amount, select the Shift key first.

1. Go to the Details tool tab.
2. Either set the Viewer to 100% and use the Pan cursor tool (H) to navigate to an area in the image or select an area with the picker in the Focus tool.
3. In the Sharpening tool, set the Amount. This slider lets you specify how much brightening and darkening you want to apply to the edges.  Higher settings apply more contrast. The majority of the sharpening adjustment is performed using this and the radius slider.
4. The Radius slider adjusts the width of the brightened and darkened areas at the edges. Typically the radius can be set low at first and increased in combination with the amount while observing the effect on the edges.
5. The Threshold slider controls the difference in brightness between adjacent edge pixels, where the sharpening effect will take place. When set to zero (0), sharpening will be applied to all the edge pixels in an image. High values affect high tonal differences between edge pixels. Typically the threshold is set low, the value between 0-1.0 is common. However, the threshold can be increased to mitigate sharpened noise (i.e., after adjusting the amount and radius).
6. Adjust the Halo Suppression slider when halo artifacts are noticeable, particularly after aggressive sharpening has been applied (i.e., after high values of amount and radius have been applied). Check images on high contrast edges for halos (dark and bright-lines) in the Focus window or Viewer at 100% or more and drag the slider to the right to reduce or eliminate them.
7. Use the Pan cursor tool to check other areas of the image at both 50% and 100%.    

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