Image Filters are used to sharpen up your rendered image or apply other filters after rendering.
Use the Tone Operator /Filters icon to launch the filters wizard after the rendering has started, (or is complete.)
Here is an image showing the original image, and the effects of a sharpening or softening filter.
Some rendering engines include these filters in their rendering interface and automatically reapply them when you re-render your image. With other rendering engines, your can use an image editing program, such as Photo Shop to apply the same filters.
A Brick House downloaded from the 3D warehouse – with an nXtRender tree and an HDRi background sky.
Software sharpening creates enhanced sharpness by making the edges more contrasty. The algorithm notices when colors or intensities change in the image and sharpens up the transitions.
Just a little sharpening can add detail to a rendering.
Softening smooths out the transitions at “edges” – where the color or the intensity changes.