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Amount of blurring
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`ksiz'
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enum
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The size of the blur kernel to apply. This value must be one of 3, 5, 7, 9, 11, 13 or 15. The larger the kernel, the longer the effect will take to run and the greater the degree of blurring.
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Brightness
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`ksum'
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Fixed
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This is the total value of the elements of the blur kernel. Normally this value will be 1.0, which blurs the source but doesn't change its brightness. If the value is between 0.0 and 1.0, the brightness is decreased, if the value is greater than 1.0, the brightness is increased.
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