The Arrow Menu
The arrow button in the top left corner displays a menu with a few local presets. They correspond to the options available on the Manual tab sheet in Easy Mode. There is a Reset menu item, which resets the controls on this tab sheets to their default values.
The Listbars Check Box
The activated Listbar check box replaces the sliders with listbar controls. To get the sliders back deactivate it again. Whereas sliders contain up to several hundreds of values, listbars only offer five to nine values as clickable items. Listbars allow an easier and faster selection of useful values.
Listbars and their corresponding sliders are automatically synchronized. But if you select a slider value that is not available in the listbar, none of the listbar items is selected. That does not mean that no value is used. The slider values always have precedence over the listbar values.
If you deactivate the Sharpness check box, no sharpening is applied. It has the same effect if you set the Amount slider to zero. Quickly activating and deactivating the Sharpness check box lets you compare the image with and without sharpening applied.
The Amount slider or listbar controls the strength of the sharpening effect. The higher the value, the stronger the sharpening. Values below 100 are usually sufficient for compensating the softening of the denoise effect.
The Surface control defines how much the surface areas of the image are sharpened. Surfaces are flat areas with little image details, which are blurred the most by denoising. A value of zero only sharpens the edges, areas with strong image details, whereas a value of 100 sharpens the whole image, edge as well as surface area, equally. A value of 50 works fine most of the time, because surfaces usually do not have to be sharpened as strong as edges.
The Radius slider or listbar defines the size of the image details that will be sharpened. For images with fine details you should use a value of 1.0. If you denoise an image with large noise particles, the image normally does not contain fine details. Then you can use a higher Radius value to produce a more effective sharpening.
Using a very high value for the Threshold slider of the Color Denoise group of the Manual tab sheet also desaturates the colors of the image. In such a case you can use the Recover slider or list bar to compensate this effect and increase the image saturation again.
Without an activated "From Original Image" check box the Recover slider works like a normal saturation control that linearly increases the saturation of all pixels. You should then be careful and not use a too high Recover value.
If the "From Original Image" check box is activated, NoiseControl compares the original and denoised image and only increases the saturation for the pixel that were desaturated during denoising. If no desaturation occurred, the Recover control has no effect. But if a strong desaturation occurred, the Recover control has a strong effect. With activated "From Original Image" check box you can use a high value (or even the highest possible value of 50) for the Recover slider. In rare cases very high values partially add back the color noise. Then you need to lower the Recover value until the artifacts vanish.
The Amount control of the Grain group adds a grain effect to the image. Although we normally do not recommend using this feature, it can help if you cannot avoid a strong denoising with a soft look and want to recreate the impression of image details by adding a bit of grain. Try to avoid too high values otherwise the grain becomes too obvious. On the other hand you can also use this feature for special effect purposes.