Blur Filter
Blur filter blurs rendering image.
Type
Blur direction and type.
Width / Quality
Width of blur. Note that the unit of width parameter is in unit of screen coordinate, not in unit of pixel.
Blured image is obtained by overwrapping offseted images. Quality parameter determing the number of images overwrapped. Larger quality value is needed for larger width parameter.
Gamma Correction
Exactly speaking, RGB value is not the true brightness on monitor, it is modified by gamma correction. Thus, simple averaging of RGB values for overlap tends to lead darker image. When this checkbox is on, this effect is cancelled by additional correction.
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