You can trun on / off effects from the top menu. If a menu item has [R click to change params...], you can right click the menu to change parameters and set the effect on.
Select to apply no unsharp/blur effects.
You can sharpen or soften images determined by parameters.
Mosaic images spaceified parameter size. You can show only grid lines without mosaic effect by changing parameters, it is convinient to reproduce images by hand.
Tune image colors by changing RGB power.
Cut off dark and bright information to enlarge contrast.
Make images monochrome by throwing away chroma information.
Invert color values.
Invert images geometrically. 90° and 180° rotation is not supported.
Make Sportlight effect. Spotlight center follows mouse cursor. It can be used to direct screen position like laser-pointer at presentation.
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