This filter creates a linear blur in a direction determined by the 「Angle」 option. The default direction is horizontal to the right (0.000 degree).
                       
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                    注記 | 
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                       These options are described in 「Common Features」.  | 
                  
In this case, 「Length」 represents the blur intensity. More Length will result in more blurring.
「Angle」 describes the direction of the movement. Thus, a setting of 90 will produce a vertical blur, and a setting of 0 will produce a horizontal blur.
This option (default) allows you to modify blur settings directly on canvas, for easier visual tweaking of blur settings. It displays a line with handle on both ends to vary direction and transform.
Press Ctrl key to change direction by 15° steps.