QuickTime 4 Reference

Blur Filter

kBlurImageFilterType ('blur')

This effect applies a convolution blur effect to a single source. The actual blur that is applied is determined by the convolution kernel. This is a matrix of values that are applied to each pixels of the source to produce the destination.

Example:

The Blur effect takes a maximum of one source and has two parameters.

Parameters

Use the descriptions below to help you understand what the parameters do. To learn how to use parameter atoms, see "Adding Video Effects to a QuickTime Movie"

Name	Code	QTAtom Type	Description
Amount of blurring	`'ksiz'`	`kParameterTypeDataEnum`	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.
Brightness	`'ksum'`	`kParameterTypeDataFixed`	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.