This filter lights the image with a soft glow, like the old trick smearing vaseline on the lens. Softglow produces this effect by making bright areas of the image brighter.
                       
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                    Nota | 
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                       These options are described in Secção 2, “Common Features”.  | 
                  
The glow radius parameter controls the sharpness of the effect, giving a "vaseline-on-the-lens" effect.
The brightness parameter controls the degree of intensification applied to image highlights.
The sharpness parameter controls how defined or alternatively diffuse the glow effect should be.