Original test image
Flat (box) filter
Tent filter
Quadratic filter
Cubic filter
Gauss filter
Mitchell filter
Catmul Rom filter
Gamma corrected Flat (box) filter
Gamma corrected Tent filter
Gamma corrected Quadratic filter
Gamma corrected Cubic filter
Gamma corrected Gauss filter
Gamma corrected Mitchell filter
Gamma corrected Catmul Rom filter
Circle Bokeh + Gamma corrected Flat (box) filter
Circle Bokeh + Gamma corrected Tent filter
Circle Bokeh + Gamma corrected Quadratic filter
Circle Bokeh + Gamma corrected Cubic filter
Circle Bokeh + Gamma corrected Gauss filter
Circle Bokeh + Gamma corrected Mitchell filter
Circle Bokeh + Gamma corrected Catmul Rom filter
To compare: Circle Bokeh Flat (box) filter, without gamma