Denoise

This transformation reduces image noise.

Clicking on the input image display centers the 1:1 preview on the location you clicked on, or you can click and drag to scroll the preview window.

Amount

The amount control lets you control how much of the denoise transformation is applied to the input image. You can apply a percentage of the transformation to the entire image, or you can specify an amount mask to restrict the effects of the transformation to only part of the input image.

Radius

Using larger radius values can provide better noise reduction, especially for large scale noise, but it takes more time. Large radius values are good for reducing broadly based noise such chroma noise in skies. Smaller radius values work well on more localized noise.

Strength

The higher the strength, the more aggressive the noise reduction, but the more fine detail you may lose.

Preview

A 1:1 preview of the sharpen effect is displayed in the right-hand side of the dialog box. Clicking on the input image display centers the preview on the location you clicked on, or you can click and drag to scroll the preview window.

If you enlarge the dialog box, you can make the sliders wider and the preview area narrower or vice versa by dragging the vertical separator line between them.

 Preview Button

Clicking the Preview button causes the full output image to be recalculated, not just the preview area. This can be useful if you want to view the entire image at once and not just a small section, but it can take longer to compute.

 Difference Button

Clicking the Difference button causes the preview to display the difference between the original image and the preview image. Differences are exaggerated by a factor of two to make them more apparent.